#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    ll N,M,K; cin >> N >> M >> K;
    char op; cin >> op;
    vector<ll> A(N), B(M);
    rep(i,M) cin >> B[i];
    rep(i,N) cin >> A[i];
    sort(A.begin(), A.end());
    sort(B.begin(), B.end());
    ll ans = 0;
    rep(i,N) {
        ll x = (op == '+' ? K - A[i] : (K + A[i] - 1) / A[i]);
        ans += B.end() - lower_bound(B.begin(), B.end(), x);
    }
    cout << ans << endl;
}