#include <stdio.h>

int main(){
int pack,sum ,chock, apack,rem;
scanf ("%d",&pack);
sum=pack;
do{
    apack=pack/2;
    rem=pack%2;
    sum =sum+apack;
    pack=rem+apack;

}
while (pack>1);
printf("%d",sum);

return 0;
}