#include<iostream>
#include<vector>
using namespace std;
int main()
{
  int a,b,c,d;
  cin >> a >> b >> c >> d;
  int cnt=31-a+b;
  if(cnt>=c)cout << 1 << endl;
  else if(cnt>=d)cout << 2 << endl;
  else cout << 3 << endl;
}