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

int main() {
    int X; int x, y; cin >> x >> y; X = x * 60 + y;
    X *= 660;
    X = (X + 43199) % 43200 + 1;
    X = 43200 - X;
    X /= 11;
    cout << X << endl;
    return 0;
}