import java.io.*;
import java.util.Random;

public class SlowInputStream extends FilterInputStream
{
    private Random r = new Random(0);
    
    public SlowInputStream(InputStream in) {
        super(in);
    }

    public int read(byte[] b, int off, int len) throws IOException {
        return super.read(b, off, r.nextInt(len) + 1);
    }
}