// Problem: No.2789 hako111223’s Master Thesis
// Group: yukicoder
// URL: https://yukicoder.me/problems/no/2789
// Memory Limit: 512 MB
// Time Limit: 2000 ms
// Author: lingfunny
// 
// Powered by CP Editor (https://cpeditor.org)

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

int a, b, c, d;

int main() {
	scanf("%d%d%d%d", &a, &b, &c, &d);
	a = b + 31 - a;
	if (a < d) puts("3");
	else if (a < c) puts("2");
	else puts("1");
	return 0;
}