#include<iostream>
using namespace std;
int main(){
int a,b,c;
cin>>a>>b>>c;
int d = max(a,max(b,c));
int e = min(a,min(b,c));
int sum = a+b+c;
if(d<sum - d && e>d-(sum - d - e)){
cout<<"la 3 canh cua tam giac";}
else{
cout<<"ko la 3 canh cua tam giac";
}
}