// editor1
#include<iostream>
using namespace std;
int main()
{
    int a,b,c;
    cin >> a >> b >> c;
    
    if((a + b > c) & & (a + c > b) & & (b + c > a))
    {
        cout << "Valid triangle";
    }
    else
    {
        cout << "Invalid triangle";
    }
    return 0;
}