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

void solve() {
  int a, b;
  cin >> a >> b;
  if (a == 12 && b == 0) a = 0;
  a %= 12;
  double t = (12.0 / 11) * 3600;
  cout << int((t * a) - (a * 3600 + b * 60)) % 3600 << endl;
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  solve();
}