#include <iostream>

int main(void) {
    unsigned int N;
    std::cin >> N;
    N--;
    N=N|(N>>1);
    N=N|(N>>2);
    N=N|(N>>4);
    N=N|(N>>8);
    N=N|(N>>16);
    N=(N&0x55555555)+(N>>1&0x55555555);
    N=(N&0x33333333)+(N>>2&0x33333333);
    N=(N&0x0f0f0f0f)+(N>>4&0x0f0f0f0f);
    N=(N&0x00ff00ff)+(N>>8&0x00ff00ff);
    N=(N&0x0000ffff)+(N>>16&0x0000ffff);
    std::cout << N << std::endl;
}