import sys
from operator import itemgetter
import math
stdin=sys.stdin
sys.setrecursionlimit(10 ** 8)

ip=lambda: int(sp())
fp=lambda: float(sp())
lp=lambda:list(map(int,stdin.readline().split()))
sp=lambda:stdin.readline().rstrip()
Yp=lambda:print('Yes')
Np=lambda:print('No')
inf = 1 << 60
eps = 1e-9
sortkey = itemgetter(0)

n = ip()
ans = n - 1

for j in range(1,int(math.log2(n)) + 1):
    i = int(pow(n, (1.0 / j)))
    while pow(i,j) <= n:
        i += 1
    i -= 1
    k = n - i ** j
    ans = min(ans, i + j + k)

print(ans)