#include <iostream>

 #include<stdio.h>

 #include<string.h>

 #include<string>

 #include<algorithm>

 #define ll long long

 using namespace std;

 #define N 100

 ll dp[];

 int main()

 {

     ll n;

     dp[]=1ll;

       dp[]=2ll;

       for(int i=;i<=;i++){

         dp[i]=2ll*(2ll*i-1ll)*dp[i-]/(i+1ll);

       }

     while(scanf("%lld",&n)!=EOF){

       printf("%lld\n",dp[n-]);

     }

     return ;

 }