#include<iostream>
#include<string>
#include<cstdio>
#include<vector>
#include<cmath>
#include<algorithm>
#include<functional>
#include<iomanip>
#include<queue>
#include<ciso646>
#include<utility>
#include<map>
#include<set>
#include<bitset>
#include<stack>
#include<cassert>
#include<random>
#include<unordered_map>
#include<numeric>
using namespace std;
using ll = long long;
const ll mod = 1000000007;
const ll INF = (1e+18) + 7;
#define rep(i,n) for(int i=0;i<n;i++)
#define Rep(i,sta,n) for(int i=sta;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define all(x) (x).begin(),(x).end()
#define stop char nyaa;cin>>nyaa;

using P = pair<int, int>;
using LP = pair<ll, ll>;


int h, w;
ll x;
ll a[1 << 17], b[1 << 17];
void solvep() {
	sort(b, b + w);
	ll ans = 0;
	rep(i, h) {
		ans += b+w - lower_bound(b, b + w, x - a[i]);
	}
	cout << ans << endl;
}
void solvem() {
	sort(b, b + w);
	ll ans = 0;
	rep(i, h) {
		ll inf = (x + a[i] - 1) / a[i];
		ans += b + w - lower_bound(b, b + w, inf);
	}
	cout << ans << endl;
}
void solve() {
	cin >> h >> w>>x;
	char c; cin >> c;
	rep(j, w)cin >> b[j]; rep(i, h)cin >> a[i];
	if (c == '+') {
		solvep();
	}
	else {
		solvem();
	}

}
signed main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	//int t; cin >> t;rep(i,t) solve();
	solve();
	stop
		return 0;
}