#include <iostream>
using namespace std;

int main() {
    int n,m,k,sum = 0;
    cin >> n >> m;
    n *= m;
    int* arrn = new int[n];
    for (int i = 0; i < n; i++) {
        cin >> arrn[i];
    }
    cin >> k;
    int* arrk = new int[k];
    for (int i = 0; i < k; i++) {
        cin >> arrk[i];
    }
    for (int i = 1; i < n; i++) {
        int j = i;
        while (j && arrn[j - 1] > arrn[j]) {
            swap(arrn[j - 1], arrn[j]);
            j--;
        }
    }
    for (int i = 1; i < n; i++) {
        int j = i;
        while (j && arrk[j - 1] > arrk[j]) {
            swap(arrk[j - 1], arrk[j]);
            j--;
        }
    }

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            if (arrn[i] >= arrk[j] && arrk[j] != 0) {
                sum++;
                arrk[j] = 0;
                arrn[i] = 0;
            }
        }
    }
    cout << sum;
    return 0;
}