The input contains a single integer *a* (1 ≤ *a* ≤ 64).

Output a single integer.
The input contains a single integer *a* (1 ≤ *a* ≤ 64).
i = int(input())

i -= 1

f = 1
x = 1

while x < i:
    x *= 2
    f += 1

print(f)