X = [2, 3, 5, 15, 17, 51, 85, 255, 257, 771, 1285, 3855, 4369, 13107, 21845, 65535, 65537, 196611, 327685, 983055, 1114129, 3342387, 5570645, 16711935, 16843009, 50529027, 84215045, 252645135, 286331153, 858993459]
A = input()
ans = -1
for x in X:
    n = A / x
    while n > 0:
        ans += 1
        n /= 2
print(ans)