#include<cstdio>

using namespace std;

int main(){
    //freopen("date.in","r",stdin);
    //freopen("date.out","w",stdout);

    int n;

    scanf("%d",&n);

    int sl=0;
    for(int i=0;(1<<i)<=n;i++){
        sl +=(bool)(n  & (1<<i));
    }

    printf("%d",sl);

    return 0;
}