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

public class Main {
    static int n;
    static int k;
    static ArrayList<HashMap<Integer, HashMap<Integer, Integer>>> dp = new ArrayList<>();
    static int[] values;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        n = sc.nextInt();
        k = sc.nextInt();
        int x = sc.nextInt() % k;
        int y = sc.nextInt() % k;
        values = new int[n];
        for (int i = 0; i < n; i++) {
            values[i] = sc.nextInt() % k;
            dp.add(new HashMap<>());
        }
        System.out.println(dfw(0, x, y));
    }
    
    static int dfw(int idx, int a, int b) {
        if (idx >= n) {
            return 0;
        }
        if (a > b) {
            return dfw(idx, b, a);
        }
        if (!dp.get(idx).containsKey(a)) {
            dp.get(idx).put(a, new HashMap<>());
        }
        if (dp.get(idx).get(a).containsKey(b)) {
            return dp.get(idx).get(a).get(b);
        }
        int count = 0;
        if ((a + b + values[idx]) % k == 0) {
            count++;
        }
        count += Math.max(dfw(idx + 1, a, b), Math.max(dfw(idx + 1, a, values[idx]), dfw(idx + 1, b, values[idx])));
        dp.get(idx).get(a).put(b, count);
        return count;
    }
}

class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public String next() throws Exception {
        if (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}