import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        FastReader in = new FastReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        No1664UnstableFn solver = new No1664UnstableFn();
        solver.solve(1, in, out);
        out.close();
    }

    static class No1664UnstableFn {
        public void solve(int testNumber, FastReader in, PrintWriter out) {
            long n = in.nextLong();
            long ans = n;
            long tmp = (long) (Math.sqrt(n) + 0.00001);
            ans = Math.min(ans, tmp + 2 + (n - tmp * tmp));
            for (long i = 2; i * i * i <= n; i++) {
                tmp = i * i * i;
                long num = 3;
                long k = (long) ((Math.log(n) / Math.log(i)) + 0.00001);
                ans = Math.min(ans, i + k + (n - (long) (Math.pow(i, k) + 0.00001)));
//            do {
//                ans = Math.min(ans,i + num + (n - tmp));
//                tmp*=i;
//
//            } while (tmp <= n);

            }
            out.println(ans);
        }

    }

    static class FastReader {
        BufferedReader br;
        StringTokenizer st = new StringTokenizer("");

        public FastReader() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        public FastReader(InputStream in) {
            br = new BufferedReader(new InputStreamReader(in));
        }

        public String next() {
            while (st == null || (!st.hasMoreElements())) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
            return st.nextToken();
        }

        public long nextLong() {
            return Long.parseLong(next());
        }

    }
}