#include "bits/stdc++.h"

using namespace std;
typedef long long int ll;
typedef pair<ll, ll > pi;  
typedef pair<pair<ll, ll >, ll > pii;  
vector<ll > vec;
vector<vector<ll > > vec2;
ll MOD = 1000000007;
ll INF = 1145141919454519;

ll N, M, K;
vector<ll > A;
vector<ll > B;
char op;

bool check(ll mid, ll i){
    if(op == '*'){
        if(B[mid] * A[i] >= K){
            return true;
        }        
    }else{
        if(B[mid] + A[i] >= K){
            return true;
        }
    }
    return false;
}

int main() {

    
    cin >> N >> M >> K;
    
    MOD = K;

    cin >> op;
    
    for(ll i = 0; i < M; i++){
        ll t; cin >> t;
        A.push_back(t);
    }
    
    for(ll i = 0; i < N; i++){
        ll t; cin >> t;
        B.push_back(t);
    }
    sort(B.begin(), B.end());
    
    ll sum = 0;
    for(ll i = 0; i < M; i++){
        ll ng = -1; ll ok = N;
        while(ng + 1 < ok){
            ll mid = (ng + ok) / 2;
            if(check(mid, i)){
                ok = mid;
            }else{
                ng = mid;
            }
        }
        //cout << N - ok << endl;
        sum += N - ok;
    }
    
    cout << sum << endl;

}