using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var strings = new string[] { "12", "abc", "1b", "0" };

        var ints = strings.Select(s => Int32.TryParse(s, out var i) ? (int?)i : null).Where(i => i != null).Select(i => (int)i);

        foreach (var i in ints)

        {

             Console.WriteLine(i * 100);

        }

    }

}