#include <bits/stdc++.h>
using namespace std;
#define repl(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define rep(i,n) repl(i,0,n)
#define mp(a,b) make_pair((a),(b))
#define pb(a) push_back((a))
#define all(x) (x).begin(),(x).end()
#define uniq(x) sort(all(x)),(x).erase(unique(all(x)),end(x))
#define fi first
#define se second
#define dbg(x) cout<<#x" = "<<((x))<<endl
template<class T,class U> ostream& operator<<(ostream& o, const pair<T,U> &p){o<<"("<<p.fi<<","<<p.se<<")";return o;}
template<class T> ostream& operator<<(ostream& o, const vector<T> &v){o<<"[";for(T t:v){o<<t<<",";}o<<"]";return o;}

#define INF 2147483600
#define MOD 1000000009L
#define DOM 1000000021L
#define MMM 1000000033L

vector<long> hash1[100005], hash2[100005];
int sz[100005];

int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  long n;
  cin>>n;
  rep(i,n){
    string s;
    cin>>s;
    sz[i] = s.size();
    hash1[i].resize(sz[i]+1);
    hash2[i].resize(sz[i]+1);
    hash1[i][0] = 0;
    hash2[i][0] = 0;
    rep(j,sz[i]){
      hash1[i][j+1] = hash1[i][j]*MOD + s[j];
//      hash1[i][j+1] %= DOM;
      hash2[i][j+1] = hash2[i][j]*MOD + s[j];
//      hash2[i][j+1] %= MMM;
    }
  }

  long m,x,d;
  cin>>m>>x>>d;

  long ans = 0;
  rep(_,m){
    long i = (x/(n-1));
    long j = (x%(n-1));
    if(i<=j) j++;

    int l=0, r=min(sz[i], sz[j]);
    while(r-l>1){
      int mid = (r+l)/2;
      if(hash1[i][mid]==hash1[j][mid] && hash2[i][mid]==hash2[j][mid]) l=mid;
      else r=mid;
    }
    ans += l;

    x = (x+d)%(n*(n-1));
  }

  cout << ans << endl;

  return 0;
}