#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int N, M;
  cin >> N >> M;
  int64_t K;
  cin >> K;
  char op;
  cin >> op;
  vector<int64_t> B(M);
  for (auto&& e : B) {
    cin >> e;
  }
  sort(B.begin(), B.end());
  int64_t res = 0;
  for (int i = 0; i < N; i++) {
    int64_t a;
    cin >> a;
    int64_t x = K;
    if (op == '+') {
      x -= a;
    } else {
      x = (x + a - 1) / a;
    }
    int p = lower_bound(B.begin(), B.end(), x) - B.begin();
    res += M - p;
  }
  cout << res << '\n';
  return 0;
}