text: #include<stdio.h>
  int main(){
  int m,k,p,n,s,pr;
  p=0;
  pr=0;
  scanf("%d",&m);
  scanf("%d",&n);
  scanf("%d",&k);
  for(s=n;m>1;m--){p++;
                   if(p%k==0)pr=pr+2;
                   s=s+n-(n*pr/100);
                  }
  printf("%d",s);
  }      
  