#include<iostream>
#include<cstdio>
using namespace std;
unsigned int n;
int main()
{
	freopen("bita.in","r",stdin);
	freopen("bita.out","w",stdout);
	int s=0;
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		unsigned int x=i;
		bool t=false;
	    while(x>0)
	    {
			if((x&1)&&t==true)
	    	{
	    		s++;
	    	}
	    	if((x&1)&&t==false)
	    	{
	    		t=1;
	    	}
	    	if((x&1)==0)
	    		t=0;
    		x>>=1;
		}
	}
	cout<<s;
	return 0;
}