#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int INF = 1e9 + 10;
const ll INFL = 4e18;

int main() {
    int A, B, C, D;
    cin >> A >> B >> C >> D;

    int d = 31 - A + B;
    if (d >= C) {
        cout << 1 << endl;
    } else if (d >= D) {
        cout << 2 << endl;
    } else {
        cout << 3 << endl;
    }
}