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

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    
    ll n,m,k;
    std::cin >> n>>m>>k;
    
    char op;
    std::cin >> op;
    vector<ll> a(n),b(m);
    
    for (int i = 0; i < m; i++) {
        std::cin >> b[i];
    }
    
    for (int i = 0; i < n; i++) {
        std::cin >> a[i];
    }
    
    sort(a.begin(),a.end());
    sort(b.begin(),b.end());
    ll ans = 0;
    for (int i = 0; i < n; i++) {
        if(op=='+'){
            ans += m-distance(b.begin(),lower_bound(b.begin(),b.end(),k-a[i]));
        }else{
            ll r = m;
            ll l = -1;
            while(r-l>1){
                ll mid = (r+l)/2;
                if(b[mid]*a[i]>=k){
                    r = mid;
                }else{
                    l = mid;
                }
            }
            ans += m-r;
        }
    }
    std::cout << ans << std::endl;
}