#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(ll i=0;i<n;i++)
#define Rep(i,a,b) for(int i=a;i<b;i++)
#define ALL(x) (x).begin(),(x).end()
#define dbgv(x); for(auto now : x) cout << now << " "; cout << endl;

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