#include <bits/stdc++.h>

using namespace std;

const unsigned long long h = 947239;

int main() {
    int n;
    cin >> n;
    vector<string> s(n);
    vector<vector<unsigned long long>> hh(n);
    for (int i = 0; i < n; i++) {
        cin >> s[i];
        hh[i].resize(s[i].size() + 1);
        hh[i][0] = 0;
        for (int j = 0; j < s[i].size(); j++) {
            hh[i][j + 1] = hh[i][j] * h + s[i][j];
        }
    }
    int m, x, d;
    cin >> m >> x >> d;

    int sum = 0;
    for (int k = 1; k <= m; k++) {
        int i, j;
        i = (x / (n - 1));
        j = (x % (n - 1));
        if (i > j) {
            swap(i, j);
        } else {
            j++;
        }
        x = (x + d) % (n * (n - 1));

        int l = 0;
        int r = min(s[i].size(), s[j].size());
        while (r - l > 1) {
            int mid = (l + r) / 2;
            if (hh[i][mid] == hh[j][mid]) {
                l = mid;
            } else {
                r = mid;
            }
        }

        sum += l;
    }

    cout << sum << endl;

    return 0;
}