using System;

public class Program

{

    public static void Main(string[] args)

    {

         int m, count = 0;

        Console.WriteLine("Enter the Limit :");

        m = int.Parse(Console.ReadLine());

        int[] a = new int[m];

        Console.WriteLine("Enter the Numbers : ");

        for (int i = 0; i < m; i++)

        {

            a[i] = Convert.ToInt32(Console.ReadLine());

        }

        foreach (int o in a)

        {

            if (o == 1)

            {count++;

            }

        }

        Console.WriteLine("Number of 1's in the Entered Number : ");

        Console.WriteLine(count);

        Console.ReadLine();

    }

}