#include <iostream>
#include <vector>
using namespace std;
int main(){
    int sum = 0;
    for(int i = 0; i < 5; i++){
        int x;
        cin >> x;
        sum += x;
    }
    if(sum <= 99) cout << "Grey";
    if(sum >= 100 && sum <= 119) cout << "Blue";
    if(sum >= 120 && sum <= 169) cout << "Green";
    if(sum >= 170 && sum <= 229) cout << "Orange";
    if(sum >= 230) cout << "Red";
    return 0;
}