#include <iostream>
using namespace std;
int main(){
    int side 1, side2, side3;
    cin >> side1 >> side2>>side3;
    if(side1+side2 >side3 &&
    side1+side3>side2 &&
    side2+side3>side1){
        cout<<"valid";
    }else{
        cout<<"Invalid";
    }
    return 0;
    }
}