def check(i,j):
    return N >= i ** j

N = int(input())
ans = 10 ** 18
for j in range(60):
    lb = 0
    ub = 10 ** 18
    while ub - lb > 1:
        mid = (ub + lb) // 2
        if check(mid,j):
            lb = mid
        else:
            ub = mid
    k = N - lb ** j
    ans = min(ans, j + lb + k)
print(ans)