#include<iostream>
using namespace std;
int main()
{
int a;
cin>>a;
if(a<1200)
{
cout<<"grey";
}
else if(a>=1200&&a<1400)
{
cout<<"green";
}
else if(a>=1400&&a<1600)
{
cout<<"cyan";
}
else if(a>=1600&&a<1900)
{
cout<<"blue";
}
else if(a>=1900&&a<2100)
{
cout<<"purple";
}
else if(a>=2100&&a<2400)
{
cout<<"orange";
}
else if(a>=2400&&a<3000)
{
cout<<"red";
}
else
{
cout<<"red-black";
}
}
