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- import java.util.*;
- import java.io.*;
- public class ceoi19pp1 {
- public static void main(String[] args) throws IOException {
- int h = readInt(); //horizontal lines
- int v = readInt(); //vertical lines
- int arrh[] = new int[h+1];
- int arrv[] = new int[v+1];
- HashMap<Integer, Integer> cnt = new HashMap<Integer, Integer>();
- int count = 0;
- for (int i=0; i<h; i++) {
- arrh[i] = readInt();
- }
- for (int i=0; i<v; i++) {
- arrv[i] = readInt();
- }
- for (int i=0; i<h; i++) {
- for (int j=i+1; j<h; j++) {
- int diff = Math.abs(arrh[j]-arrh[i]);
- if(cnt.containsKey(diff)) cnt.put(diff, cnt.get(diff)+1);
- else cnt.put(diff, 1);
- }
- }
- for (int i=0; i<v; i++) {
- for (int j=i+1; j<v; j++) {
- int diff = Math.abs(arrv[j]-arrv[i]);
- if(cnt.containsKey(diff)) count += cnt.get(diff);
- }
- }
- System.out.print(count);
- exit();
- }
- final private static int BUFFER_SIZE = 1 << 16;
- private static DataInputStream din = new DataInputStream(System.in);
- private static byte[] buffer = new byte[BUFFER_SIZE];
- private static int bufferPointer = 0, bytesRead = 0;
- static PrintWriter pr = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
- public static String readLine() throws IOException {
- byte[] buf = new byte[64]; // line length
- int cnt = 0, c;
- while ((c = Read()) != -1) {
- if (c == '\n')
- break;
- buf[cnt++] = (byte) c;
- }
- return new String(buf, 0, cnt);
- }
- public static String read() throws IOException{
- byte[] ret = new byte[1024];
- int idx = 0;
- byte c = Read();
- while (c <= ' ') {
- c = Read();
- }
- do {
- ret[idx++] = c;
- c = Read();
- } while (c != -1 && c != ' ' && c != '\n' && c != '\r');
- return new String(ret, 0, idx);
- }
- public static int readInt() throws IOException {
- int ret = 0;
- byte c = Read();
- while (c <= ' ')
- c = Read();
- boolean neg = (c == '-');
- if (neg)
- c = Read();
- do {
- ret = ret * 10 + c - '0';
- } while ((c = Read()) >= '0' && c <= '9');
- if (neg)
- return -ret;
- return ret;
- }
- public static long readLong() throws IOException {
- long ret = 0;
- byte c = Read();
- while (c <= ' ')
- c = Read();
- boolean neg = (c == '-');
- if (neg)
- c = Read();
- do {
- ret = ret * 10 + c - '0';
- } while ((c = Read()) >= '0' && c <= '9');
- if (neg)
- return -ret;
- return ret;
- }
- public static double readDouble() throws IOException {
- double ret = 0, div = 1;
- byte c = Read();
- while (c <= ' ')
- c = Read();
- boolean neg = (c == '-');
- if (neg)
- c = Read();
- do {
- ret = ret * 10 + c - '0';
- } while ((c = Read()) >= '0' && c <= '9');
- if (c == '.') {
- while ((c = Read()) >= '0' && c <= '9') {
- ret += (c - '0') / (div *= 10);
- }
- }
- if (neg)
- return -ret;
- return ret;
- }
- private static void fillBuffer() throws IOException {
- bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
- if (bytesRead == -1)
- buffer[0] = -1;
- }
- private static byte Read() throws IOException {
- if (bufferPointer == bytesRead)
- fillBuffer();
- return buffer[bufferPointer++];
- }
- public void close() throws IOException {
- if (din == null)
- return;
- din.close();
- }
- static void print(Object o) {
- pr.print(o);
- }
- static void println(Object o) {
- pr.println(o);
- }
- static void flush() {
- pr.flush();
- }
- static void println() {
- pr.println();
- }
- static void exit() throws IOException {
- din.close();
- pr.close();
- System.exit(0);
- }
- }
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