#include<stdio.h>
int main ()
{
    double a,b,c;
    scanf("%lf %lf %lf",&a,&b,&c);
    if (a+b>c && b+c>a && c+a>b && a!=0 && b!=0 && c!=0)
    {
        printf("Valid triangle\n");
    }
    else
        printf("Not valid triangle\n");
    return 0;
}