#include<iostream>
using namespace std;
int equationCount(int n,int m)
{
	if(n==1||m==1)
		return 1;
	else if(n<m)
		return equationCount(n,n);
	else if(n==m)
		return 1+ equationCount(n,n-1);
	else
		return equationCount(n,m-1)+equationCount(n-m,m);
}
int main()
{
	int n;
	cin>>n;
	cout<< equationCount(n,n) << endl;
	return 0;
}