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();
    }
    
}