from math import * 

n = int(input())

ans = 10**100

for j in range(0,73):
    if j == 0:
        num = 1
        k = n-num
        ans = min(ans,1+k)
    elif j == 1:
        ans = min(ans,1+n)
    elif j == 2:
        sq_i = int(sqrt(n))
        for i in range(max(1,sq_i-10),sq_i+11):
            num = i**j
            if num > n:
                break
            k = n-num
            ans = min(ans,i+j+k)
    else:
        for i in range(1,10**6+1):
            num = i**j
            if num > n:
                break
            k = n-num
            ans = min(ans,i+j+k)
            
print(ans)