import random
def solve():
    n = int(input())
    import math
    ans = 10 ** 20
    for j in range(0,100):
        if j == 0:
            ans = min(ans, 1 + 0 + n - 1)
        elif j == 1:
            ans = min(ans, n + 1)
        else:
            i = math.floor(pow(n, 1/j) + 10 ** (-10))
            if i ** j <= n < (i + 1) ** j:
                ans = min(ans, i + j + n - i ** j)
    print(ans)

t = 1
for i in range(t):
    solve()