using System.Collections.Generic;
using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var n = int.Parse(line[0]);
        var m = int.Parse(line[1]);
        var k = int.Parse(line[2]);
        line = Console.ReadLine().Trim().Split(' ');
        var op = line[0];
        var a = new int[m];
        for (int i = 0; i < m; i++) a[i] = int.Parse(line[i + 1]);
        var b = new int[n];
        for (int i = 0; i < n; i++) b[i] = int.Parse(Console.ReadLine().Trim());
        Array.Sort(b);
        var ans = 0;
        for (int i = 0; i < m; i++)
        {
            int t;
            if (op == "+") t = k - a[i];
            else t = (a[i] + k - 1) / a[i];
            var w = LowerBound(b, t);
            ans += n - w;
        }
        Console.WriteLine(ans);

    }
    public static int LowerBound<T>(T[] arr, int start, int end, T value, IComparer<T> comparer)
    {
        int low = start;
        int high = end;
        int mid;
        while (low < high)
        {
            mid = ((high - low) >> 1) + low;
            if (comparer.Compare(arr[mid], value) < 0) low = mid + 1;
            else high = mid;
        }
        return low;
    }
    public static int LowerBound<T>(T[] arr, T value) where T : IComparable =>
                                   LowerBound(arr, 0, arr.Length, value, Comparer<T>.Default);
}