import math
def Next(): return input()
def NextInt(): return int(Next())
def NextInts(): return map(int,input().split())
def Nexts(): return map(str,input().split())
def NextIntList(): return list(map(int,input().split()))
def RowInts(n): return [int(input()) for i in range(n)]

def cal(n, x):
    y = int(math.pow(n, 1/x))
    ok, ng = 0, y*2
    while ng - ok > 1:
        now =(ng+ok)//2
        if now**x > n:
            ng = now
        else:
            ok = now
    return ok + x + (n-ok**x)

n = int(input())
ans = n
for i in range(2, 63):
    now = cal(n, i)
    if now < ans:
        ans = now

print(ans)