#include <bits/stdc++.h>   using namespace std;   int main() {     int a, b, c, d;     scanf( %d%d%d%d , &a, &b, &c, &d);     int a1 = abs(a - c) * 2;     int b1 = abs(b - d) * 2;     int ans = a1 + b1 + 4;     if (a != c && b != d)       printf( %d n , ans);     else       printf( %d n , ans + 2);     return 0;   }   