using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace 递归
{
class Program
{
public static long fact(int n)
{
if (n == 1)
{ return 1; }
else
{
return n * fact(n-1);
}
}
static void Main(string[] args)
{
Console.WriteLine(fact(3));
Console.Read();
}
}
}