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

using ll=long long;

int main(){cin.tie(0);ios::sync_with_stdio(false);
	int N,M,K;cin>>N>>M>>K;
	string op;cin>>op;
	vector<int>B(M);
	for(int i=0;i<M;++i){
		cin>>B[i];
	}
	sort(B.begin(),B.end());
	ll z=0;
	for(int i=0;i<N;++i){
		int A;cin>>A;
		z+=B.end()-lower_bound(B.begin(),B.end(),op=="+"?K-A:(K-1)/A+1);
	}
	cout<<z<<"\n";
	return 0;
}