using System;

namespace Example21
{
	/// <summary>
	/// Summary description for Class1.
	/// </summary>
	class Class1
	{
		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main(string[] args)
		{
			Console.Write("Input number of positive integers to input: ");
			int N = int.Parse(Console.ReadLine());

			int sum = 0;
			int positiveNumber;

			for (int i = 1; i <= N; i++)
			{
				// loop until a positive integer is entered
				do
				{
					Console.Write("Enter a positive integer: ");
					positiveNumber = int.Parse(Console.ReadLine());
				} while (positiveNumber <= 0);

				sum = sum + positiveNumber;
			}

			Console.WriteLine("Sum of {0} positive integers is {1} ",
				N, sum);

		}
	}
}