using System;
 
namespace ConsoleApp1
{
    class program
    {
        static void Main(string[] args)
        {
            int x = 0;
            int y = 0;
            int z = 0;
 
            Console.WriteLine("１から２０までの数字を入力");
            x = int.Parse(Console.ReadLine());
 
            if(x > 0 && x <= 20)
            {
                for (y = 1; y <= x; y++)
                {
                    for (z = 1; z <= y; z++)
                    {
                        Console.Write("*");
                    }
                    Console.WriteLine("");
                }
            }
            else
            {
                Console.WriteLine("エラーです");
            }
 
 
        }
    }
}
 

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18