#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; i++)
using namespace std;

typedef long long ll;

int main() {
    vector<int> a(23);
    rep(i, 23) {
        a[i] = 60 * 60 * 12 * i / 11;
        //cout << a[i] << "\n";
    }
    int A, B;
    cin >> A >> B;
    int C = A * 3600 + B * 60;
    rep(i, 23) {
        if (C <= a[i]) {
            cout << a[i] - C << "\n";
            return 0;
        }
    }
}