#include <iostream>
 #include <iomanip>
 #include <cmath>
 #include <algorithm>
 #include <cstdlib>
 #include <limits.h>
 #include <string>

 #define ll long long

 using namespace std;
 void Fast_IO();
 void Rofyda_Elghadban(){
   #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
    #endif
}
int main()
 {   Rofyda_Elghadban();
 //Fast_IO();
 //freopen("input.txt","r",stdin);
 //freopen("output.txt","r",stdout);
 int l1,l2,l3;
 double num=((l1+l2+l3)/2),area;
 cin>>l1>>l2>>l3;
 area=sqrt(num*(num-l1)*(num-l2)*(num-l3));
 if((l1+l2<=l3)||(l2+l3<=l1)||(l1+l3<=l2)){
  cout<<"Invalid"<<endl;
 }else{
  cout<<"Valid"<<endl;
  cout<<area<<endl;
 }







 return 0;
 }