b: #include <bits/stdc++.h>
using namespace std;
double a,b,c;
int main()
{
cin>>a>>b>>c;
if ((a>0) and (b>0) and (c>0) and (a+b>c) and (a+c>b) and (b+c>a)) cout<<"Day la ba canh trong mot tam giac";
else cout<<"Day khong la ba canh trong mot tam giac";
return 0;
}