import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

public class Exercise19_12 {
  public static void main(String[] args) throws Exception {
    // Check usage
    if (args.length < 2) {
      System.out.println(
        "Usage: java Exercise19_12 SourceFile1 ... SoureFilen TargetFile");
      System.exit(0);
    }

    // The last file TargetFile is for output
    BufferedOutputStream output = new BufferedOutputStream(
      new FileOutputStream(new File(args[args.length - 1])));

    for (int i = 0; i < args.length - 1; i++) {
      BufferedInputStream input = new BufferedInputStream(
        new FileInputStream(new File(args[i])));

      int value;
      while ((value = input.read()) != -1) {
        output.write(value);
      }
      
      input.close();
    }

    output.close();
  }
}