def main():
    N = int(input())
    #print("2 * N", 2 * N)
    #print("get_nomal_point(N)", get_nomal_point(N))
    print(2 * N - get_nomal_point(N))

def get_nomal_point(value):
    point = 0
    while value > 0:
        point += value
        value = value // 2
        #print("point", point)
        #print("value", value)
    return point

if __name__ == '__main__':
    main()