import sys, re from collections import deque, defaultdict, Counter from math import ceil, sqrt, hypot, factorial, pi, sin, cos, radians, log2 from itertools import accumulate, permutations, combinations, product from operator import itemgetter, mul from copy import deepcopy from string import ascii_lowercase, ascii_uppercase, digits from bisect import bisect, bisect_left from fractions import gcd from heapq import heappush, heappop from functools import reduce import numpy as np def input(): return sys.stdin.readline().strip() def INT(): return int(input()) def MAP(): return map(int, input().split()) def LIST(): return list(map(int, input().split())) def ZIP(n): return zip(*(MAP() for _ in range(n))) sys.setrecursionlimit(10 ** 9) INF = float('inf') mod = 10 ** 9 + 7 A = INT() ans = INF for N in range(2, 100): M = ceil(log2(A)/log2(N)) ans = min(ans, N*M) print(ans)