n = int(input())
import math
ans = 10 ** 20
for j in range(0,100):
    if j == 0:
        ans = min(ans, 1 + 0 + n - 1)
    elif j == 1:
        ans = min(ans, n + 1)
    else:
        for i in range(1,n + 1):
            if i ** j >= n:
                break
        i -= 1
        ans = min(ans, i + j + n - i ** j)

print(ans)