# include <bits/stdc++.h>
using namespace std;
typedef long long ll;

ll n, sum;

ll ksm(ll x, ll y)
{
	ll res;
	res = 1;
	while (y)
	{
		res = (y & 1) ? res * x : res;
		x = x * x;
		y >>= 1;
	}
	return res;
}

int main()
{
	scanf("%lld", &n);
	sum = n;
	for (int i = 1; i <= log2(n); i++) sum -= n / ksm(2, i);
	printf("%lld\n", sum);
	return 0;
}