#include <bits/stdc++.h>

int main()
{
	int N, M;
	int64_t K;
	char op;
	scanf("%d%d%lld %c", &N, &M, &K, &op);
	std::vector<int64_t> A(N), B(M);
	for (auto& e: B)
		scanf("%lld", &e);
	for (auto& e: A)
		scanf("%lld", &e);
	std::sort(A.begin(), A.end());
	std::sort(B.begin(), B.end());
	B.push_back(1'000'000'000);

	auto calc{
		[&](int64_t a, int64_t b)
		{
			if (op == '+') return a + b;
			else return a * b;
		}
	};
	int64_t ans{};
	int ok{M};
	for (auto& e: A)
	{
		while (ok > 0 && calc(e, B[ok - 1]) >= K)
			ok--;
		ans += M - ok;
	}
	printf("%lld\n", ans);

	return 0;
}