Strong Number Check

void Main()
{
    int number = int.Parse(Console.ReadLine());
    int firstNum = number;
    int helpInt;
    int sum = 0;
    while(number > 0)
    {
        helpInt = number%10;
        number = number/10;
        int multi = 1;
        for(int i = helpInt;i>0;i--)
        {
            multi *= i;
        }
        sum += multi;
    }
    Console.WriteLine(sum);
    if(sum == firstNum)
    {
        Console.WriteLine("Yes");
    }
    else
    {
        Console.WriteLine("No");
    }

}