#include <bits/stdc++.h>
using namespace std;

int main() {
    int64_t n, m, k;
    cin >> n >> m >> k;
    char op;
    cin >> op;
    vector<int64_t> a(n), b(m);
    for (int i = 0; i < m; i++) cin >> b.at(i);
    for (int i = 0; i < n; i++) cin >> a.at(i);
    sort(a.begin(), a.end());
    sort(b.begin(), b.end());
    int64_t ans = 0;
    for (int i = 0; i < n; i++) {
        int64_t r = (op == '+') ? k - a.at(i) : (k - 1) / a.at(i) + 1;
        ans += b.end() - lower_bound(b.begin(), b.end(), r);
    }
    cout << ans << endl;
}