#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);++i)
using namespace std;
using ll = long long;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int a,b,c,d;
    cin >> a >> b >> c >> d;
    int x = 31-a+b;
    if(x>=c) cout << 1 << endl;
    else if(x>=d) cout << 2 << endl;
    else cout << 3 << endl;
}