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();
        char op = sc.next().charAt(0);
        long[] arrB = new long[m];
        for (int i = 0; i < m; i++) {
            arrB[i] = sc.nextInt();
        }
        Arrays.sort(arrB);
        long[] arrA = new long[n];
        for (int i = 0; i < n; i++) {
            arrA[i] = sc.nextInt();
        }
        Arrays.sort(arrA);
        int idxB = m - 1;
        long count = 0;
        if (op == '+') {
            for (int i = 0; i < n; i++) {
                while (idxB >= 1 && arrB[idxB - 1] + arrA[i] >= k) {
                    idxB--;
                }
                if (arrB[idxB] + arrA[i] >= k) {
                    count += m - idxB;
                }
            }
        } else {
            for (int i = 0; i < n; i++) {
                while (idxB >= 1 && arrB[idxB - 1] * arrA[i] >= k) {
                    idxB--;
                }
                if (arrB[idxB] * arrA[i] >= k) {
                    count += m - idxB;
                }
            }
         }
         System.out.println(count);
    }
}