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

#define rep(i, ss, ee) for (int i = (ss); i < (ee); ++i)

void solve() {
  vector<double> tm(13);
  double t = (12.0 / 11) * 3600;
  rep(i, 0, 13) { tm[i] = t * i; }

  int a, b;
  cin >> a >> b;
  a %=12; 
  int x = (a * 3600 + b * 60);
  int ans;
  if (tm[a] - x >= 0) {
    ans = tm[a] - x;
  } else {
    ans = tm[a + 1] - x;
  }

  cout << ans << endl;
}

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