#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;

int main() {
    int a, b, c, d; cin >> a >> b >> c >> d;
    int t = 31 - a + b;
    if(c <= t && d <= t) cout << 1 << endl;
    else if(d <= t) cout << 2 << endl;
    else cout << 3 << endl;
}