Problem: Apart from having lots of holidays throughout the year, residents of Berland also have whole lucky years. Year is considered lucky if it has no more than 1 non-zero digit in its number. So years 100, 40000, 5 are lucky and 12, 3001 and 12345 are not.

You are given current year in Berland. Your task is to find how long will residents of Berland wait till the next lucky year.

Input

The first line contains integer number n (1 ≤ n ≤ 109) — current year in Berland.

Output

Output amount of years from the current year to the next lucky one.

Examples

Input

4


Output

1


Input

201


Output

99


Input

4000


Output

1000

Note

In the first example next lucky year is 5. In the second one — 300. In the third — 5000.

Solution (in JAVA):

Solution:
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.io.IOException;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author Alexander Tsupko (alexander.tsupko@outlook.com)
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        TaskA solver = new TaskA();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskA {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int n = in.nextInt();
            String s = String.valueOf(n);
            char[] c = s.charAt(0) == '9' ? new char[s.length() + 1] : new char[s.length()];
            Arrays.fill(c, '0');
            c[0] = s.charAt(0) == '9' ? '1' : (char) (s.charAt(0) + 1);
            out.print(Integer.parseInt(new String(c)) - n);
        }

    }

    static class InputReader {
        private InputStream stream;
        private byte[] buffer = new byte[1024];
        private int current;
        private int size;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        private int read() {
            if (size == -1) throw new InputMismatchException();
            if (current >= size) {
                current = 0;
                try {
                    size = stream.read(buffer);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (size <= 0) return -1;
            }
            return buffer[current++];
        }

        public int nextInt() {
            int c = read();
            while (isSpaceCharacter(c)) c = read();
            int sign = 1;
            if (c == '-') {
                sign = -1;
                c = read();
            }
            int result = 0;
            do {
                if (c < '0' || c > '9') throw new InputMismatchException();
                result *= 10;
                result += c - '0';
                c = read();
            } while (!isSpaceCharacter(c));
            return result * sign;
        }

        private boolean isSpaceCharacter(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

    }
}