private static void setStream(String in, String out) {
try {
System.setIn(new BufferedInputStream(new FileInputStream(in)));
System.setOut(new PrintStream(out));
} catch (Exception e) {
e.printStackTrace();
}
}
void pln(String s) {
try {
bw.write(s);
bw.write(System.lineSeparator());
} catch (Exception ex) {
}
}
/** @param args */
public static void main(String[] args) throws Exception {
File file = new File("input.txt");
if (file.exists()) {
System.setIn(new BufferedInputStream(new FileInputStream("input.txt")));
}
out = System.out;
bw = new BufferedWriter(new PrintWriter(out));
// sc = new Scanner(System.in);
br = new BufferedReader(new InputStreamReader(System.in));
C231 t = new C231();
t.solve();
bw.close();
}