#include <iostream>
using namespace std;
int n, i;
int main()
{
	cin>>n;
	int fct=1;
	long long prim[15]={0, 1, 2, 6, 20, 70, 252, 924, 3432, 12870, 48620, 184756, 705432, 2704156, 10400600};
	cout<<prim[n];
}