using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("enter number");

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

        int sum = 0;

        while(sum < number)

        {

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

            sum = sum + num;

        }   

        Console.WriteLine(sum);

    }

}