"""

r ** j = n

"""

import math
import sys
from sys import stdin

n = int(stdin.readline())

ans = n
for j in range(2,70):

    l = 1
    r = max( l+10 , 10**9 )

    while r-l != 1:

        i = (l+r)//2
        if i**j > n:
            r = i
        else:
            l = i

    i = l
    k = n - i**j

    #print (i,j,k)

    ans = min(ans , i+j+k)

print (ans)