using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("tedad daneshamozan :");

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

        int[] numbers = new int[studentNumber];

        int sath1 = 0;

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

        {

            Console.WriteLine("shayestegi daneshamoz {0}:", i+1);

            numbers[i] = int.Parse(Console.ReadLine());

        }

        foreach (var number in numbers) {

            if (number == 1)

                sath1 = sath1 + 1;

        }

        Console.WriteLine("tedad daneshamoozan ba sath 1 ==> {0}",sath1);

    }

}