#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef string str;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    ll a, b, c, d;
    cin >> a >> b >> c >> d;
    b += 31;
    if (a + c <= b && a + d <= b) cout << 1;
    else if (a + c != b && a + d <= b) cout << 2;
    else if (a + c != b && a + d != b) cout << 3;
    return 0;
}