#include <cstdio>

using namespace std;

int a[101]={0};
int n,ans=0;

int main()
{
	freopen("bita.in","r",stdin);
	freopen("bita.out","w",stdout);
	
	scanf("%d",&n);
	
	int j;
	
	for(int i=1;i<=n;i++)
	{
		int x=i;
		j=0;
		while(x!=1)
		{
			a[j]=x%2;
			x=x/2;
			
			j++;
		}
		
		a[j+1]==1;
		
		for(int k=0;k<=101;k++)
		{
			if((a[k+1]==1&&a[k]==1)||(a[k]==1&&a[k-1]==1))
			{
				ans++;
			}
		}
		
		
	}
	
	printf("%d",ans+1);
	
	fclose(stdin);
	fclose(stdout);
	
	return 0;
}