#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a, b;
    cin >> a >> b;
    a %= 12;
    double time1 = (b*6)%360;
    double time2 = (a*6)%360+ (b*1.00)/2.0;
    int aa = 2 * 6 * b;
    int bb = 2 * 30 * a + b;
    if (aa > bb) {
        cout << ((720 - (aa - bb)) * 60 / 11) << endl;
    } else {
        cout << ((bb - aa) * 60 / 11) << endl;
    }
}