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

using ll = long long;
#define rep(i, n) for(int i = 0; i < n; i++)

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