n = int(input())

ans = n

for j in range(1,61):
    i = int(n**(1/j))
    plus = (i+1)**j
    if plus <= n:
        k = n-plus
        ans = min(ans,i+1+j+k)
    else:
        k = n - i**j
        ans = min(ans,i+j+k)
    #print(ans,i,j,k)
        
print(ans)