#include<bits/stdc++.h>
using namespace std;
int main() {
  int A, B, C, D;
  cin >> A >> B >> C >> D;
  int d = 31 - A + B;
  if (d >= C) {
    cout << 1;
  } else if (d >= D) {
    cout << 2;
  } else {
    cout << 3;
  }
  cout << endl;
}