#include <bits/stdc++.h>

using namespace std;

int solve(int A, int B){
    int tmp1 = 60 * A + B;
    int tmp2 = 12 * B;
    int d = (tmp1 - tmp2) % 720;
    if (d < 0) d += 720;
    return d * 60 / 11;
}

int main(void){
    int A, B;
    cin >> A >> B;
    cout << solve(A, B) << endl;
    return 0;
}