import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int m = sc.nextInt();
        int k = sc.nextInt();
        boolean isPlus = (sc.next().charAt(0) == '+');
        int[] colums = new int[m];
        for (int i = 0; i < m; i++) {
            colums[i] += sc.nextInt();
        }
        Arrays.sort(colums);
        int[] rows = new int[n];
        for (int i = 0; i < n; i++) {
            rows[i] = sc.nextInt();
        }
        Arrays.sort(rows);
        int idx = n;
        long sum = 0;
        for (int i = 0; i < m; i++) {
            if (isPlus) {
                while (idx > 0 && rows[idx - 1] + colums[i] >= k) {
                    idx--;
                }
            } else {
                while (idx > 0 && rows[idx - 1]  >= (k + colums[i] - 1) / colums[i]) {
                    idx--;
                }
            }
            sum += n - idx;
        }
        System.out.println(sum);
    }
}