p1011

#include<iostream>
using namespace std;
int main()
{
	int n,f[1001]={0};
	cin>>n;
	for (int i=1;i<=n;i++)
	{
		for (int j=1;j<=i/2;j++)
			f[i]=f[i]+f[j];
		f[i]++;
	}
	cout<<f[n];
	return 0;
}