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

#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define P pair<int, int>

int main() {
  double a, b;
  cin >> a >> b;

  double s = ((int)a % 12) * 30 +  b * 0.5;
  double l = b * 6;
  
  if (s >= l) {
    cout << (int) (60 * (s-l)/5.5) << endl;
  } else {
    cout << (int) (60 * (360-(l-s))/5.5) << endl;
  }

}