/* -*- coding: utf-8 -*-
 *
 * 2789.cc:  No.2789 hako111223's Master Thesis - yukicoder
 */

#include<cstdio>
#include<algorithm>
 
using namespace std;

/* main */

int main() {
  int a, b, c, d;
  scanf("%d%d%d%d", &a, &b, &c, &d);

  int l = 31 - a + b;
  int x = 3;
  if (l >= c) x = 1;
  else if (l >= d) x = 2;

  printf("%d\n", x);
	 
  return 0;
}