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

#define int long long

signed main(){

    int n, m;
    cin >> n >> m;
    int k;
    cin >> k;

    char op;
    cin >> op;

    int a[100010];
    int b[100010];
    int sum = 0;

    for(int i = 0;i < m;i++){
        cin >> b[i];
    }

    sort(b, b+m);

    for(int i = 0;i < n;i++) cin >> a[i];

    int ans = 0;
    for(int i = 0;i < n;i++){
        if(op == '+'){
            ans += m-(lower_bound(b, b+m, k-a[i])-b); 
        }else{
            int l = 0, r = k;
            while(r-l > 1){
                int mid = (l+r)/2;
                if(mid*a[i] >= k){
                    r = mid;
                }else{
                    l = mid;
                }
            }

            ans += m-(lower_bound(b, b+m, r)-b);
        }
    }
	
    cout << ans << endl;

    return 0;
}