#include <bits/stdc++.h>   using namespace std;   int x1, x2, x3;   int Y1, y2, y3;   int main() {     cin >> x1 >> Y1 >> x2 >> y2;     x3 = (x1 <= x2 ? x2 + 1 : x2 - 1);     y3 = (Y1 <= y2 ? y2 + 1 : y2 - 1);     int r = 0;     if (x1 == x2 || Y1 == y2) r = 2;     cout << r + 2 * abs(x1 - x3) + 2 * abs(Y1 - y3);     return 0;   }   