#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;
int main(){
    int a,b,c,d;
    cin>>a>>b>>c>>d;
    int dist = (31-a)+b;
    if(dist>=c) cout<<1<<endl;
    else if(dist<c && dist>=d) cout << 2 << endl;
    else cout<< 3 << endl;
}