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

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

	double b = B * 360 / 60;
	double a = A % 12 * 360 / 12 + b / 12;
	double d = a - b;
	if( d < 0 ) d = 360 + d;
	double l = (double)360 / 60 / 60;
	double s = (double)360 / 12 / 60 / 60;
	double p = l - s;
	double sec = d / p;

	printf( "%.0lf\n", sec );
}