import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        int n = in.nextInt();
        int m = in.nextInt();
        int flag = 0;
        int[][] matrix = new int[n][m];
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                matrix[i][j] = in.nextInt();
            }
        }
        int k = in.nextInt();
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                if (flag != 1) {
                    if (matrix[i][j] == 0) {
                        int chislo = 0;
                        for (int z = j; z < m; z++) {
                            if (matrix[i][z] == 0) {
                                chislo++;
                            } else {
                                break;
                            }
                        }
                        if (chislo == k) {
                            flag = 1;
                            System.out.print(i + 1);
                            break;
                        }
                    }

                }
            }
        }
        if (flag == 0) {
            System.out.print(0);
        }
        in.close();
    }
}