#include <iostream>
using namespace std;

int main()
{
    int a, b, c;
    cin >> a >> b >> c;
    
    if (a > 0 && b > 0 && c > 0) {
        if (a + b > c && a + c > b && b + c > a) {
            cout << "3 so la 3 canh tam giac";
        }
        else cout << "3 so khong la 3 canh tam giac";
    }
    else cout << "3 so khong la 3 canh tam giac";
    return 0;
}

#include<bits/stdc++.h>

using namespace std;

int main ( ) {

long long a,b,c;

cout<<"moi ban nhap a";

cin>>a;

cout<<" moi ban nhap b";

cin>>b;

cout<<" moi ban nhap c";

cin>>c;

if(a+b>c and a+c>b and b+c>a){

cout<<"3 canh nay thuoc tam giac";

}

else{

cout<<" 3 canh nay khong thuoc tam giac";

}

}