#include <bits/stdc++.h>
using namespace std;
int main(){
int r; if(!(cin>>r)) return 0;
if(620<=r && r<=780) cout<<"Red\n";
else if(590<=r && r<620) cout<<"Orange\n";
else if(570<=r && r<590) cout<<"Yellow\n";
else if(495<=r && r<570) cout<<"Green\n";
else if(450<=r && r<495) cout<<"Blue\n";
else if(425<=r && r<450) cout<<"Indigo\n";
else cout<<"Violet\n";
return 0;
}
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