using System;
public class Frog
{
public static int Fib(int n)
{
int resault = 0;
if (n == 0)
return 0;
if (n == 1)
return 1;
if (n > 1)
return Fib(n - 1) + Fib(n - 2);
return resault;
}
public static int NumberOfWays(int n)
{
return Fib(n+1);
}
public static void Main(String[] args)
{
Console.WriteLine(NumberOfWays(3));
}
}