https://www.acmicpc.net/problem/1085
#include <bits/stdc++.h>
using namespace std;
int main(){
int x, y, w, h;
cin >> x >> y >> w >> h;
int xlong = min(x, w-x);
int ylong = min(y, h-y);
cout << min(xlong, ylong);
return 0;
}