#include<iostream>
#include<fstream>
using namespace std;
const int maxn=50;
int n;
int count(int x)
{
	int i,c=0;
	int b[maxn],p=0;
	while(x>0){
		int t=x%2;x=x/2;
		b[p++]=t;
	}
	for(i=0;i<p-1;i++)
		if(b[i]==1&&b[i+1]==1) c++;
	return c;
}
int main()
{
	freopen("bita.in","r",stdin);
	freopen("bita.out","w",stdout);
	cin>>n;
	int c;
	for(int i=1;i<=n;i++)
		c+=count(i);
	cout<<c;
	return 0;
}