#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

double a, b;
int main()  
{
  ios::sync_with_stdio(false);
  cin.tie(0);

  cin >> a >> b;
  double c = (a + b * 2) / 3;
  cout << setprecision(1) << fixed << c << '\n';
  if (c >= 8.0) cout << "Gioi";
  else if (6.5 <= c and c < 8.0) cout << "Kha";
  else if (5.0 <= c and c < 6.5) cout << "Trung binh";
  else if (3.5 <= c and c < 5.0) cout << "Yeu";
  else if (c < 3.5) cout << "Yeu";
  return 0;
}

// tdq