using System;
using System.Collections.Generic;
using System.Linq;
class MainClass {
static void Main() {
var nums = new int[5] { 4, 8, 15, 16, 23};
Array.ForEach(nums, n => Console.WriteLine(n));
int myIndex = Array.BinarySearch(nums, 8);
Console.WriteLine("Index: " + myIndex);
}
}