#include <iostream>
using namespace std;
int main() {
    int a,b,c;
    cin>>a>>b>>c;
    if ((a+b>c) && (a+c>b) && (b+c>a)) {
        cout<<"la tam giac"<<endl;
    } else {
        cout<<"khong la tam giac."<<endl;
    }
    return 0;
}

#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
    int a,b,c;
    cin>>a>>b>>c;
    if(a+b>c&&a+c>b&&b+c>a){
        cout<<"3 canh la 3 canh cua tam giac";
    }
    else cout<<"3 canh khong phai la 3 canh cua tam giac";
    //Author: Tôn Thất Bảo Đạt
}