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

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;
	}
}