#include<iostream>
using namespace std;
int main() {
double a, b, c;
cout << "Canh 1: "; cin >> a;
cout << "Canh 2: "; cin >> b;
cout << "Canh 3: "; cin >> c;
if (a > 0 && b > 0 && c > 0) {
if (a < b + c || b < a + c || c < a + b) {
cout << "Day la do dai ba canh cua mot tam giac";
} else {
cout << "Day khong phai do dai ba canh cua mot tam giac";
}
}else {
cout << "Do dai cac canh cua mot tam giac phai lon hon 0";
}
return 0;
}