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

int main()
{
	long long A, B;
	cin >> A >> B;

	long long c = (long long)360 * 60 * 60 * 12;
	long long b = B * c / 60;
	long long a = A % 12 * c / 12 + b / 12;
	int ans = 0;
	while( abs( a - b ) > 2000 && ans < 1900 ) {
		b += c / 60 / 60;
		if( b > c ) b -= c;
		a += c / 12 / 60 / 60;
		if( a > c ) a -= c;
		ans++;
	}

	cout << ans << endl;
}