public static void Main()
Console.WriteLine("Write Number");
string s = Console.ReadLine();
bool cislook = Int32.TryParse(s, out number);
if (cislook==false) return;
Console.WriteLine("Write repeating number");
string f = Console.ReadLine();
for(int i = 0; i < z; i++)
Console.WriteLine("{0} * {1} = {2}", number, y, result );
Console.WriteLine("{0} * {1} = {2}", number, y, result );