递归斐波那契数列

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace net
{
    class Hello
    {
        static void Main()
        {
            Console.WriteLine(Digu(30));
        }

        static int Digu(int n)
        {
            if (n == 1 || n == 2)
            {
                return 1;
            }
            else
            {
                return Digu(n - 1) + Digu(n - 2);
            }
        }
    }
}