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 = toLong((Math.sqrt(n)));
            ans = Math.min(ans, tmp + 2 + (n - tmp * tmp));
            for (long i = 2; i * i * i <= n; i++) {
                long k = toLong((Math.log(n) / Math.log(i)));
                if (Math.pow(i, k) > n) {
                    out.println(i + " " + k);
                }
                ans = Math.min(ans, i + k + (n - toLong(Math.pow(i, k))));

            }
            out.println(ans);
        }

        private long toLong(double sqrt) {
            long tmp = (long) sqrt;
            if (Math.abs(tmp + 1.0 - sqrt) < 0.00000001) return tmp + 1;
            return tmp;
        }

    }

    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());
        }

    }
}