题解

#include<iostream>
using namespace std;
int main(){
    int n;
    cin>>n;
    if(n<=770&&n>=622){
        cout<<"red";
    }else if(n>=597&&n<=621){
        cout<<"orange";
    }else if(n>=577&&n<=596){
        cout<<"yellow";
    }else if(n>=492&&n<=576){
        cout<<"green";
    }else if(n>=455&&n<=491){
        cout<<"blue";
    }else if(n>=350&&n<=454){
        cout<<"purple";
    }else{
        cout<<"invisible light";
    }
    return 0;
}