#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  ll n, m, k;
  cin >> n >> m >> k;
  char op;
  cin >> op;
  vector<ll> a(n), b(m);
  rep(i, m) cin >> b[i];
  rep(i, n) cin >> a[i];
  sort(b.begin(), b.end());
  ll ans = 0;
  rep(i, n) {
    auto it = lower_bound(b.begin(), b.end(), op == '+' ? k - a[i] : (k + a[i] - 1) / a[i]);
    ans += b.end() - it;
  }
  cout << ans << '\n';
  return 0;
}