B = list(bin(int(input()))[2:][::-1])
N = len(B)
ans = 0
i = 0
while i < N:
    if B[i] == "0":
        while B[i] == "0":
            i += 1
        ans += 1
        if i == N-1:
            break
    else:
        while i < N and B[i] == "1":
            i += 1
        ans += 1
        if i == N:
            ans += 1
            break
        B[i] = "1"
print(ans)