// #define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define rep(i, n) for (int i = 0; i < n; ++i)
#define REP(i, n) for (int i = 0; i < n; ++i)
#define range(i,a,b) ((a)<=(i) && (i)<(b))
#define debug(x) cout << #x << ' ' << '=' << ' ' << (x) << endl;
#define fs first
#define sc second
#define pb push_back
#define eb emplace_back
typedef long long ll;
typedef pair<ll, ll> P;
typedef tuple<ll, ll, ll> T;
typedef vector<ll> vec;
typedef vector<P> pvec;
typedef vector<vector<ll>> vvec;
typedef vector<vector<P>> pvvec;
typedef priority_queue<ll> PQI;
typedef priority_queue<P> PQP;
typedef priority_queue<ll,vector<ll>,greater<ll>> PQIG;
typedef priority_queue<P,vector<P>,greater<P>> PQPG;
const vector<int> dx = {0, -1, 0, 1, 1, 1, -1, -1};
const vector<int> dy = {1, 0, -1, 0, 1, -1, 1, -1};
const int MOD = (1000000007);
// const int MOD = (998244353);
// const int INF = (1 << 30);
const int INF = (1LL << 60);
const double EPS = (1 >> 30);
template<class T> inline bool chmin(T& a, T b) {if (a > b) {a = b; return 1;} return 0;}
template<class T> inline bool chmax(T& a, T b) {if (a < b) {a = b; return 1;} return 0;}



signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << fixed << setprecision(15);
    //---------------------------------------------
    
    int n,m;
    cin>>n>>m;
    int k;cin>>k;
    char x;
    cin>>x;
    vec b(m);
    vec a(n);
    ll sua=0,sub=0;
    rep(i,m) cin>>b[i],sub+=b[i];
    rep(i,n) cin>>a[i],sua+=a[i];
    ll cnt=0;
    sort(all(a));sort(all(b));
    if(x=='+'){
        rep(i,m){
            cnt+=a.end()-lower_bound(all(a),k-b[i]);
        }
        rep(i,n){
            cnt+=b.end()-lower_bound(all(b),k-a[i]);
        }
        cout<<cnt/2<<endl;
    }
    else{
        rep(i,m){
            cnt+=a.end()-lower_bound(all(a),(k+b[i]-1)/b[i]);
        }
        rep(i,n){
            cnt+=b.end()-lower_bound(all(b),(k+a[i]-1)/a[i]);
        }
        cout<<cnt/2<<endl;
    }
    

    
}