public static void Main()
Console.WriteLine("enter first number");
int num1 = int.Parse(Console.ReadLine());
Console.WriteLine("enter second number");
int num2 = int.Parse(Console.ReadLine());
Console.WriteLine("enter third number");
int num3 = int.Parse(Console.ReadLine());
if (num1 == num2 & num2 == num3)
else if (num1 != num2 & num2 != num3 & num1 != num3)
Console.WriteLine("1+1+1");
Console.WriteLine("1+2");