#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  int a, b, c, d;
  cin >> a >> b >> c >> d;
  int rem = b + 31 - a;
  if (rem >= c) {
    cout << "1" << endl;
  }
  else if (rem >= d) {
    cout << "2" << endl;
  }
  else {
    cout << "3" << endl;
  }
  return 0;
}