using System;

​

public class Program

{

    static int CountWord(String s)

    {

        int count = 0;

        char[] cArr = s.ToCharArray();

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

        {

            if (cArr[i] == ' ')

                count++;

        }

​

        if (cArr[0] == ' ')

            return count;

        else

            return count + 1;

    }

​

    public static void Main()

    {

        Console.WriteLine("Введите строку:");

        string str1 = Console.ReadLine();

        Console.WriteLine("Количество слов: " + CountWord(str1));

    }

}