import math
A = int(input())
if A<=6:
    print(A)
else:
    v = int(math.log(A, 2))
    w = int(math.log(A, 3))
    for v in range(v, v+10000):
        if 2**v>=A:
            ans = 2*v
            break
    for w in range(w, w+10000):
        if 3**w>=A:
            ans = min(ans, 3*w)
            break
    print(ans)