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

int main()
{
    int n, i,m,nr=0,ok=0;
    FILE *fis_in, *fis_out;

    fis_in = fopen("in.txt", "rt");
    fis_out = fopen("out.txt", "wt");
    fscanf(fis_in, "%d", &n);

    for (i = 31; i >= 0; i--)
    {
        if ((n >> i) & 1)
            break;
    }

    i--;
    for (; i >= 0; i--)
    {
        if ((n >> i) & 1)
            nr += i;
        else
        {
            nr += i + 1;
            ok = 1;
        }
    }
    if (ok == 1)
        fprintf(fis_out, "%d", nr);
    else
        fprintf(fis_out, "0");
}