n = int(input())

import sys
if n == 1:
    print(1)
    exit()
if n == 2:
    print(2)
    exit()

j = 1
_min = n
while 1 << j <= n:
    start = 2
    end = n
    while end - start > 1:
        mid = (start + end) // 2
        if mid ** j <= n:
            start = mid
        else:
            end = mid
    ans = start + j + n - start ** j
    if ans < _min:
        _min = ans
    j += 1
print(_min)