public static void Main()
Console.WriteLine("First value ");
String v1 = Console.ReadLine();
int val1 = Convert.ToInt16(v1);
Console.WriteLine("Second value ");
String v2 = Console.ReadLine();
int val2 = Convert.ToInt16(v2);
ar1[3] = ar1[1] + ar1[2];
Console.WriteLine(ar1[3]);