public static void Main()
Console.Write(" insert number 1 : " ) ;
N1 = int.Parse(Console.ReadLine()) ;
Console.Write( " intsert number 2 : ") ;
N2 = int.Parse(Console.ReadLine()) ;
Console.Write( " intsert number 3 : ") ;
N3 = int.Parse(Console.ReadLine()) ;
Console.WriteLine( " Valves are : " ) ;
Console.WriteLine(" N1 = {0} , N2 = {1} , N3 = {2} " , N1,N2,N3 ) ;
Console.WriteLine(" N1+ N2+ N3 = {0} " , N1 + N2 + N3 ) ;
Console.WriteLine(" {0} * {1} * {3} = {3} " , N1 , N2, N3 , N1*N2*N3 ) ;