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

int main() {
    int N, M, K;
    cin >> N >> M >> K;
    char op; cin >> op;
    vector<int64_t> B(M), A(N);
    for(auto &e : B) cin >> e;
    for(auto &e : A) cin >> e;
    sort(B.begin(), B.end());
    auto f = [&](int64_t a, int64_t b) -> int64_t { return op == '+' ? a + b : a * b; };
    int64_t ans = 0;
    for(int i = 0; i < N; ++i) {
        auto OK = [&](int x) -> bool { return f(A[i], B[x - 1]) < K; };
        int l = 0, r = M + 1;
        while(r - l > 1) {
            int c = (l + r) / 2;
            if(OK(c)) l = c;
            else r = c;
        }
        ans += M - l;
    }
    cout << ans << '\n';
    return 0;
}