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

signed main() {
	int a, b;
	cin >> a >> b;
	if (a / 5000 == b / 200000) {
		cout << 1 << endl;
	}
	else if (a / 5000 / 5000 == b / 200000 / 200000) {
		cout << 2 << endl;
	}
	else exit(-1);
}