wef

#include <iostream>
#include <cmath>
#include <stdio.h>

using namespace std;

int main()
{
    freopen("lesson.in", "r", stdin);
    freopen("lesson.out", "w", stdout);

    long int a, b, c, d;

    cin >> a >> b >> c >> d;

    long long maxx = max(max(a*(b+c-d), d*(c+b-a)), max(c*(a+d-b), b*(d+a-c)));

    if (a*(b+c-d) == maxx)
        cout << 0;
    else if (c*(a+d-b) == maxx)
        cout << 1;
    else if (d*(c+b-a) == maxx)
        cout << 2;
    else if (b*(d+a-c) == maxx)
        cout << 3;

    return 0;
}