N = int(input())

# jは最大でも60

ans = N
for j in range(1, 60):
    i = N ** (1/j)
    floor, ceil = int(i), int(i)+1
    for i in range(max(0, floor), ceil+1):
        if i**j > N:
            break
        k = N - i**j
        ans = min(ans, i+j+k)

print(ans)