#include<iostream>
using namespace std;
 
class triangle{
private:
  int side1,side2,side3;
  
public:
  void getData(){
      cin>>side1>>side2>>side3;
  }  
  
  void checkTriangle(){
      if((side1 + side2> side3) && (side2 + side3> side1) && (side1 + side3 > side2)){
          cout<<"Valid";
      } else {
          cout<<"Ivalid";
      }
  }
 };
 int main(){
     Triangle t;
     t.getData();
     t.checkTriangle();
     return 0;
 }