import sys
from math import sqrt

input = sys.stdin.readline

n = int(input())
ans = n
# j = 2
m = int(sqrt(n))
for i in range(max(m-100000, 0), min(m+100001, n)):
    if i > 0 and i*i <= n:
        ans = min(ans, i + 2 + (n - i * i))
# j >= 3
for j in range(3, 61):
    if 2**j > n:
        break
    i = 2
    while True:
        if i ** j > n:
            break
        k = n - i**j
        ans = min(ans, i + j + k)
        i += 1
print(ans)