#include <iostream>
using namespace std;

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