import java.io.FileInputStream;
import java.io.IOException;
import java.util.zip.CRC32;
import java.util.zip.Checksum;
public class Main {
public static void main(String[] args) throws IOException {
FileInputStream fin = new FileInputStream("a.zip");
Checksum cs = new CRC32();
for (int b = fin.read(); b != -1; b = fin.read()) {
cs.update(b);
}
System.out.println(cs.getValue());
fin.close();
}
}