using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(fizzString2(15));

    }

    public static String fizzString(String str) {

      String st = "";

        if (str[0] ==  'f') st += "Fizz";

        if (str[str.Length - 1] == 'b') st += "Buzz";

        if (st == "") st += str;

      return st;

    }

​

    static string fizzString2(int A) {        

        var st = string.Empty;

​

        if (getRemainder(A,3) == 0) st += "Fizz";

        if (getRemainder(A,5) == 0) st += "Buzz";

        if (st == string.Empty) st += A;

​

        return st + "!";

​

    }

    static int getRemainder(int num, int divisor)

    {

        return (num - divisor * (num / divisor));

    }

}