import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int row = sc.nextInt();
int col = sc.nextInt();
int[][] matrix = new int[row][col];
for (int i = 0; i < row; i++) {
for (int j = 0; j < col; j++) {
matrix[i][j] = sc.nextInt();
}
}
int val = sc.nextInt();
int count = 0;
for (int i = 0; i < row; i++) {
label: for (int j = 0; j < col; j++) {
int product = 1;
for (int k = 0; k <= i; k++) {
for (int l = 0; l <= j; l++) {
product *= matrix[k][l];
if (product > val) continue label;
}
}
count++;
}
}
System.out.println(count);
}
}