#include <stdio.h>
#include <math.h>

int main(void)
{

	int N;
	scanf("%d",&N);
	int T=N;
	int K=0;
	int S[1000000];
	while(T!=0)
	{	T=floor(T/2);
		S[K]=N+2*T;
		K++;
		N=N+T;
	}
	int max;
	max = S[0];
    for (int i = 1; i < K; i++) 
    {
        if (max < S[i])
         {
            max = S[i];
        }
    }
    int answer=max-N;
	printf("%d\n",answer);
}