#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 1000000000000000001



int main(){
	
	int A,B,C,D;
	cin>>A>>B>>C>>D;
	
	int rem = B + (31-A);
	if(C<=rem)cout<<1<<endl;
	else if(D<=rem)cout<<2<<endl;
	else cout<<3<<endl;
	
	return 0;
}