#include <bits/stdc++.h>  // clang-format off
using namespace std;
using Int = long long;
#define REP2(i, n) for (Int i = 0, max_i = (n); i < max_i; i++)
#define REP3(i, a, b) for (Int i = (a), max_i = (b); i < max_i; i++)
#define OVERLOAD2(_1, _2, _3, name, ...) name
#define REP(...) OVERLOAD2(__VA_ARGS__, REP3, REP2)(__VA_ARGS__)
struct SetupIO { SetupIO() { cin.tie(nullptr), ios::sync_with_stdio(false), cout << fixed << setprecision(13); } } setup_io;
#ifndef _MY_DEBUG
#define dump(...)
#endif  // clang-format on

/**
 *    author:  knshnb
 *    created: Fri Feb 14 21:57:55 JST 2020
 **/

signed main() {
    Int n, m, K;
    cin >> n >> m >> K;
    char op;
    cin >> op;
    vector<Int> b(m);
    REP(j, m) cin >> b[j];
    vector<Int> a(n);
    REP(i, n) cin >> a[i];
    sort(a.begin(), a.end());
    sort(b.begin(), b.end());
    Int ans = 0;
    if (op == '+') {
        REP(i, n) { ans += b.end() - lower_bound(b.begin(), b.end(), K - a[i]); }
    } else {
        REP(i, n) { ans += b.end() - lower_bound(b.begin(), b.end(), (K + a[i] - 1) / a[i]); }
    }
    cout << ans << endl;
}