import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
sys.setrecursionlimit(10**7)
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################



n = ni()
ans = n-1

def f(x):
    ng = 2*10**18
    ok = 0
    while ng-ok>1:
        d = (ok+ng)//2
        if d**x<=n:
            ok = d
        else:
            ng = d
    return ok

for b in range(2,100):
    a = f(b)
    ans = min(ans,b+a+n-a**b)
    #print(b+a+n-a**b)
print(ans)