#include <bits/stdc++.h>
using namespace std;

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