import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String[] sa = br.readLine().split(" ");
		int n = Integer.parseInt(sa[0]);
		int m = Integer.parseInt(sa[1]);
		int k = Integer.parseInt(sa[2]);
		sa = br.readLine().split(" ");
		String s = sa[0];
		double[] b = new double[m];
		for (int i = 0; i < b.length; i++) {
			b[i] = Long.parseLong(sa[i + 1]);
		}
		long[] a = new long[n];
		for (int i = 0; i < a.length; i++) {
			a[i] = Long.parseLong(br.readLine());
		}
		br.close();

		Arrays.parallelSort(a);
		Arrays.parallelSort(b);

		long ans = 0;
		for (int i = 0; i < a.length; i++) {
			long v = 0;
			if ("+".equals(s)) {
				v = k - a[i];
			} else {
				v = (k + a[i] - 1) / a[i];
			}
			int idx = Arrays.binarySearch(b, v - 0.5);
			idx = ~idx;
			ans += m - idx;
		}
		System.out.println(ans);
	}
}