using System;

using System.Collections;

​

public class Program

{

    Stack stc = new Stack();

    public static int min = int.MaxValue;

    public static void Main()

    {

        int[] arr = new int[]{18, 19, 29, 15, 16};

        Program obj = new Program();

        for (int i = 0; i < arr.Length; i++)

        {

            obj.stc.Push(arr[i]);

        }

​

        while (obj.stc.Count > 0)

        {

            int p = Convert.ToInt32(obj.stc.Peek());

            if (p < min)

            {

                min = p;

            }

​

            obj.stc.Pop();

        }

​

        Console.WriteLine(min);

    }

}