What will be the output of the following C# code?

class recursion 
{
    int fact(int n) 
    {
        int result;
        if (n == 1)
        return 1;
        result = fact(n - 1) * n;
        return result;
    }
} 
class Program 
{
    public static void main(String args[]) 
    {
        recursion obj = new recursion() ;
        Console.WriteLine(obj.fact(4));
    }
}