#include<bits/stdc++.h>
//ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef unsigned int ui;
typedef pair<int,int> pii;
typedef pair<pii,int> ppii;
typedef pair<int,pii> pipi;
typedef pair<ll,ll> pll;
typedef pair<pll,ll> ppll;
typedef pair<ll,pll> plpl;
typedef tuple<ll,ll,ll> tl;
ll mod=1000000007;
ll mod2=998244353;
ll mod3=1000003;
ll mod4=998244853;
ll inf=1LL<<60;
long double pi=3.14159265358979323846L;
double eps=1e-12;
#define rep(i,m,n) for(ll i=m;i<n;i++)
#define rrep(i,n,m) for(ll i=n;i>=m;i--)
#define srep(itr,st) for(auto itr=st.begin();itr!=st.end();itr++)
int dh[4]={1,-1,0,0};
int dw[4]={0,0,1,-1};
int ddh[8]={-1,-1,-1,0,0,1,1,1};
int ddw[8]={-1,0,1,-1,1,-1,0,1};
ll gcd(ll a,ll b){
    if(a<b)swap(a,b);
    if(b==0)return a;
    if(a%b==0)return b;
    return gcd(b,a%b);
}
ll Pow(ll n,ll k){
    ll ret=1;
    ll now=n;
    while(k>0){
        if(k&1)ret*=now;
        now*=now;
        k/=2;
    }
    return ret;
}
ll beki(ll n,ll k,ll md){
  ll ret=1;
  ll now=n;
  while(k>0){
    if(k%2==1){
      ret*=now;
      ret%=md;
    }
    now*=now;
    now%=md;
    k/=2;
  }
  return ret;
}
ll gyaku(ll n,ll md){
  return beki(n,md-2,md);
}
ll dat[800010];
ll u;
void seginit(ll n){
  ll y=1;
  for(int i=0;;i++){
    
    if(y>=n){
      u=y;
      break;
    }
    y*=2;
  }
  fill(dat,dat+2*u,-inf);
}
void add(ll n,ll x){
  ll i=n+u-1;
  dat[i]=x;
  while(i>0){
    i=(i-1)/2;
    dat[i]=max(dat[2*i+1],dat[i*2+2]);
  }
}
ll que(ll a,ll b,ll k,ll l,ll r){
  if(a>=r||b<=l)return -inf;
  if(a<=l&&b>=r)return dat[k];
  ll m1=que(a,b,2*k+1,l,(l+r)/2);
  ll m2=que(a,b,2*k+2,(l+r)/2,r);
  return max(m1,m2);
}
int main(){
    ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    ll n,m,k;cin>>n>>m>>k;
    char o;cin>>o;
    ll b[m];
    ll a[n];
    vector<ll> v;
    rep(i,0,m){
        cin>>b[i];
        v.push_back(b[i]);
    }
    sort(v.begin(),v.end());
    ll ans=0;
    rep(i,0,n){
        cin>>a[i];
        ll ka;
        if(o=='+')ka=k-a[i];
        else ka=(k+a[i]-1)/a[i];
        ll y=lower_bound(v.begin(),v.end(),ka)-v.begin();
        ans+=m-y;
    }
    cout<<ans<<endl;
    
}