using System;
namespace Project_3
{
class Program
public static void Main()
int n;
Console.Write("Nhap vao n = ");
n = int.Parse(Console.ReadLine());
bool kq = KiemTraSNT.kiemTraSNT(n);
if (kq == true)
Console.WriteLine("La so nguyen to.");
}
else
Console.WriteLine("Khong La so nguyen to.");