#include <bits/stdc++.h>
using namespace std;
int main(){
    int a, b; cin >> a >> b;
    if(a >= 12) a -= 12;
    long double lo = 6 * b;
    long double sh = 30 * a + 0.5 * b;

    if(sh < lo) sh += 360;
    sh -= lo;
    long double ans = sh/(5.5/60);
    cout << (int)ans << endl;
    return 0;
}