#include <iostream>
using namespace std;

int main() {
    long long side1, side2, side3;
    cin >> side1 >> side2 >> side 3;
    
    if(side1 + side2 + side3 && side1 + side3 >side2 && side2 + side 3 > side1) 
    
        cout << "Valid triangle";
     else 
         cout << "Invalid triangle";
    return 0;
    }