N=int(input())
'''

i=1のとき
(i,j,k)=(1,j,N-1)
'''
ans=N
j=1
while(2**j<=N):
    low=2
    high=2
    while(high**j<=N):
        high*=2
    while(high-low>1):
        mid=(high+low)//2
        if mid**j<=N:
            low=mid
        else:
            high=mid
    i=low
    k=N-i**j
    ans=min(ans,i+j+k)
    j+=1
print(ans)