#include<bits/stdc++.h>
#define int long long
using namespace std;
signed main() {
  int N, M, K;
  char op;
  cin >> N >> M >> K >> op;
  vector<int> A(N), B(M);
  for (auto &x : B) cin >> x;
  for (auto &x : A) cin >> x;
  A.push_back(0);
  sort(A.begin(), A.end());
  sort(B.begin(), B.end());

  int ans = 0;
  for (auto x : B) {
    int lo = 0, hi = A.size();
    while (hi - lo > 1) {
      int mid = (hi + lo) / 2;
      int t = (op == '+' ? x + A[mid] : x * A[mid]);
      if (t < K) lo = mid;
      else hi = mid;
    }
    ans += N - lo;
  }
  cout << ans << endl;
}