"""
1 - 1 -> 0

2 - 10 -> 1
3 - 11 -> 3

4 - 100 -> 2
5 - 101 -> 5
6 - 110 -> 4
7 - 111 -> 4

8 - 1000 -> 3
9 - 1001 -> 8
10 - 1010
"""


def main():
    N = int(input()) - 1

    if N == 0:
        print(0)
        return

    N_bin = bin(N)[2:]

    print(len(N_bin) + N_bin.count("0"))

main()