#import <stdio.h>
int main() {
    int n;
    scanf("%d ", &n);
    char A[101];
    char B[101];
    char C[101];
    scanf("%s", A);
    scanf("%s", B);
    scanf("%s", C);
    int ans = 0;
    for (int i = 0; i < n; i++) {
        char a = A[i];
        char b = B[i];
        char c = C[i];
        if (a != b && b != c && c != a) ans += 2;
        else if (!(a==b && b==c))
            ans++;
    }
    printf("%d\n", ans);
}

; ModuleID = '/data/TheStack_IR/OJ_Samples/Collated/ObjectiveC/Source_380/source.m'
source_filename = "/data/TheStack_IR/OJ_Samples/Collated/ObjectiveC/Source_380/source.m"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-linux-gnu"

@.str = private unnamed_addr constant [4 x i8] c"%d \00", align 1
@.str.1 = private unnamed_addr constant [3 x i8] c"%s\00", align 1
@.str.2 = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1

; Function Attrs: nofree nounwind uwtable
define dso_local i32 @main() local_unnamed_addr #0 {
entry:
  %n = alloca i32, align 4
  %A = alloca [101 x i8], align 16
  %B = alloca [101 x i8], align 16
  %C = alloca [101 x i8], align 16
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %n) #4
  %call = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %n)
  call void @llvm.lifetime.start.p0(i64 101, ptr nonnull %A) #4
  call void @llvm.lifetime.start.p0(i64 101, ptr nonnull %B) #4
  call void @llvm.lifetime.start.p0(i64 101, ptr nonnull %C) #4
  %call1 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull %A)
  %call3 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull %B)
  %call5 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull %C)
  %0 = load i32, ptr %n, align 4, !tbaa !5
  %cmp50 = icmp sgt i32 %0, 0
  br i1 %cmp50, label %for.body.preheader, label %for.cond.cleanup

for.body.preheader:                               ; preds = %entry
  %wide.trip.count = zext i32 %0 to i64
  %min.iters.check = icmp ult i32 %0, 8
  br i1 %min.iters.check, label %for.body.preheader60, label %vector.ph

vector.ph:                                        ; preds = %for.body.preheader
  %n.vec = and i64 %wide.trip.count, 4294967288
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.phi = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %25, %vector.body ]
  %vec.phi54 = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %26, %vector.body ]
  %1 = getelementptr inbounds [101 x i8], ptr %A, i64 0, i64 %index
  %wide.load = load <4 x i8>, ptr %1, align 8, !tbaa !9
  %2 = getelementptr inbounds i8, ptr %1, i64 4
  %wide.load55 = load <4 x i8>, ptr %2, align 4, !tbaa !9
  %3 = getelementptr inbounds [101 x i8], ptr %B, i64 0, i64 %index
  %wide.load56 = load <4 x i8>, ptr %3, align 8, !tbaa !9
  %4 = getelementptr inbounds i8, ptr %3, i64 4
  %wide.load57 = load <4 x i8>, ptr %4, align 4, !tbaa !9
  %5 = getelementptr inbounds [101 x i8], ptr %C, i64 0, i64 %index
  %wide.load58 = load <4 x i8>, ptr %5, align 8, !tbaa !9
  %6 = getelementptr inbounds i8, ptr %5, i64 4
  %wide.load59 = load <4 x i8>, ptr %6, align 4, !tbaa !9
  %7 = icmp eq <4 x i8> %wide.load, %wide.load56
  %8 = icmp eq <4 x i8> %wide.load55, %wide.load57
  %9 = icmp eq <4 x i8> %wide.load56, %wide.load58
  %10 = icmp eq <4 x i8> %wide.load57, %wide.load59
  %11 = select <4 x i1> %7, <4 x i1> <i1 true, i1 true, i1 true, i1 true>, <4 x i1> %9
  %12 = select <4 x i1> %8, <4 x i1> <i1 true, i1 true, i1 true, i1 true>, <4 x i1> %10
  %13 = icmp eq <4 x i8> %wide.load58, %wide.load
  %14 = icmp eq <4 x i8> %wide.load59, %wide.load55
  %15 = select <4 x i1> %11, <4 x i1> <i1 true, i1 true, i1 true, i1 true>, <4 x i1> %13
  %16 = select <4 x i1> %12, <4 x i1> <i1 true, i1 true, i1 true, i1 true>, <4 x i1> %14
  %17 = select <4 x i1> %7, <4 x i1> %9, <4 x i1> zeroinitializer
  %18 = select <4 x i1> %8, <4 x i1> %10, <4 x i1> zeroinitializer
  %19 = xor <4 x i1> %17, <i1 true, i1 true, i1 true, i1 true>
  %20 = xor <4 x i1> %18, <i1 true, i1 true, i1 true, i1 true>
  %21 = zext <4 x i1> %19 to <4 x i32>
  %22 = zext <4 x i1> %20 to <4 x i32>
  %23 = select <4 x i1> %15, <4 x i32> %21, <4 x i32> <i32 2, i32 2, i32 2, i32 2>
  %24 = select <4 x i1> %16, <4 x i32> %22, <4 x i32> <i32 2, i32 2, i32 2, i32 2>
  %25 = add <4 x i32> %23, %vec.phi
  %26 = add <4 x i32> %24, %vec.phi54
  %index.next = add nuw i64 %index, 8
  %27 = icmp eq i64 %index.next, %n.vec
  br i1 %27, label %middle.block, label %vector.body, !llvm.loop !10

middle.block:                                     ; preds = %vector.body
  %bin.rdx = add <4 x i32> %26, %25
  %28 = call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> %bin.rdx)
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %for.cond.cleanup, label %for.body.preheader60

for.body.preheader60:                             ; preds = %for.body.preheader, %middle.block
  %indvars.iv.ph = phi i64 [ 0, %for.body.preheader ], [ %n.vec, %middle.block ]
  %ans.052.ph = phi i32 [ 0, %for.body.preheader ], [ %28, %middle.block ]
  br label %for.body

for.cond.cleanup:                                 ; preds = %for.body, %middle.block, %entry
  %ans.0.lcssa = phi i32 [ 0, %entry ], [ %28, %middle.block ], [ %ans.1, %for.body ]
  %call34 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i32 noundef %ans.0.lcssa)
  call void @llvm.lifetime.end.p0(i64 101, ptr nonnull %C) #4
  call void @llvm.lifetime.end.p0(i64 101, ptr nonnull %B) #4
  call void @llvm.lifetime.end.p0(i64 101, ptr nonnull %A) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %n) #4
  ret i32 0

for.body:                                         ; preds = %for.body.preheader60, %for.body
  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ %indvars.iv.ph, %for.body.preheader60 ]
  %ans.052 = phi i32 [ %ans.1, %for.body ], [ %ans.052.ph, %for.body.preheader60 ]
  %arrayidx = getelementptr inbounds [101 x i8], ptr %A, i64 0, i64 %indvars.iv
  %29 = load i8, ptr %arrayidx, align 1, !tbaa !9
  %arrayidx7 = getelementptr inbounds [101 x i8], ptr %B, i64 0, i64 %indvars.iv
  %30 = load i8, ptr %arrayidx7, align 1, !tbaa !9
  %arrayidx9 = getelementptr inbounds [101 x i8], ptr %C, i64 0, i64 %indvars.iv
  %31 = load i8, ptr %arrayidx9, align 1, !tbaa !9
  %cmp11.not = icmp eq i8 %29, %30
  %cmp15.not = icmp eq i8 %30, %31
  %or.cond = select i1 %cmp11.not, i1 true, i1 %cmp15.not
  %cmp20.not = icmp eq i8 %31, %29
  %or.cond48 = select i1 %or.cond, i1 true, i1 %cmp20.not
  %or.cond49 = select i1 %cmp11.not, i1 %cmp15.not, i1 false
  %not.or.cond49 = xor i1 %or.cond49, true
  %inc = zext i1 %not.or.cond49 to i32
  %ans.1.v = select i1 %or.cond48, i32 %inc, i32 2
  %ans.1 = add nuw nsw i32 %ans.1.v, %ans.052
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %for.cond.cleanup, label %for.body, !llvm.loop !13
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.vector.reduce.add.v4i32(<4 x i32>) #3

attributes #0 = { nofree nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nofree nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #3 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #4 = { nounwind }

!llvm.linker.options = !{}
!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"Ubuntu clang version 18.0.0 (++20231007042255+8abb2ace888b-1~exp1~20231007042414.1230)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11, !12}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !12, !11}
