import java.io.*;

class Main {

    static InputStreamReader isr = new InputStreamReader(System.in);
    static BufferedReader in = new BufferedReader(isr);
    static OutputStreamWriter osw = new OutputStreamWriter(System.out);
    static BufferedWriter out = new BufferedWriter(osw);

    static final int M = 1300, N = 130, L = 66;
    static int m, n, l, t;
    //使用byte节约空间
    static byte[][][] g = new byte[L][M][N];
    static boolean[][][] flag = new boolean[L][M][N];
    static int cnt;

    //往6个方向移动的技巧
    static int[] mi = {-1, 0, 0, 0, 1, 0};
    static int[] mj = {0, -1, 0, 0, 0, 1};
    static int[] mk = {0, 0, 1, -1, 0, 0};

    static boolean check(int ni, int nj, int nk) {
        return ni < l && ni >= 0 && nj < m && nj >= 0 && nk < n && nk >= 0 && !flag[ni][nj][nk];
    }

    static int dfs(int i, int j, int k) {
        flag[i][j][k] = true;
        if (g[i][j][k] == 0) return 0;
        int num = 1;
        for (int o = 0; o < 6; o++) {
            int ni = i + mi[o];
            int nj = j + mj[o];
            int nk = k + mk[o];
            if (check(ni, nj, nk)) num += dfs(ni, nj, nk);
        }
        return num;
    }

    public static void main(String[] args) throws IOException {
        String[] strs = in.readLine().split(" ");
        m = Integer.parseInt(strs[0]);
        n = Integer.parseInt(strs[1]);
        l = Integer.parseInt(strs[2]);
        t = Integer.parseInt(strs[3]);
        for (int i = 0; i < l; i++) {
            for (int j = 0; j < m; j++) {
                strs = in.readLine().split(" ");
                for (int k = 0; k < n; k++) g[i][j][k] = (byte) Integer.parseInt(strs[k]);
            }
        }

        for (int i = 0; i < l; i++) {
            for (int j = 0; j < m; j++) {
                for (int k = 0; k < n; k++) {
                    if (flag[i][j][k]) continue;
                    int v = dfs(i, j, k);
                    if (v >= t) cnt += v;
                }
            }
        }
        out.write(cnt + "");

        in.close();
        isr.close();
        out.flush();
        out.close();
        osw.close();
    }
}