import java.io.*; import java.util.*; import java.util.stream.*; public class Main { public static void main(String[] args) throws Exception { Scanner sc = new Scanner(); long n = sc.nextLong(); long ans = n - 1; for (int i = 2; i <= 60; i++) { long left = 1; long right = Long.MAX_VALUE / 2; while (right - left > 1) { long m = (left + right) / 2; if (pow(m, i) <= n) { left = m; } else { right = m; } } ans = Math.min(ans, i + left + n - pow(left, i)); } System.out.println(ans); } static long pow(long x, int p) { if (p == 0) { return 1; } else if (p % 2 == 0) { if (Long.MAX_VALUE / 2 / x <= x) { return Long.MAX_VALUE / 2; } else { return pow(x * x, p / 2); } } else { long tmp = pow(x, p - 1); if (Long.MAX_VALUE / 2 / tmp <= x) { return Long.MAX_VALUE / 2; } else { return pow(x, p - 1) * x; } } } } class Utilities { static String arrayToLineString(Object[] arr) { return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n")); } static String arrayToLineString(int[] arr) { return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new)); } } class Scanner { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer st = new StringTokenizer(""); StringBuilder sb = new StringBuilder(); public Scanner() throws Exception { } public int nextInt() throws Exception { return Integer.parseInt(next()); } public long nextLong() throws Exception { return Long.parseLong(next()); } public double nextDouble() throws Exception { return Double.parseDouble(next()); } public int[] nextIntArray() throws Exception { return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray(); } public String next() throws Exception { while (!st.hasMoreTokens()) { st = new StringTokenizer(br.readLine()); } return st.nextToken(); } }