#include <iostream>
#include <vector>
#include <fstream>


int main() {
    setlocale(LC_ALL, "ru");

    std::ifstream fin("input.txt");

    std::vector<int> greed(1001);

    int size, value, count = 0;

    fin >> size;

    for (int i = 0; i < size; i++) {
        fin >> value;
        greed[value]++;
    }

    fin >> size;

    for (int i = 0; i < size; i++) {
        fin >> value;
        if (greed[value]) {
            count++;
            greed[value]--;
        }
        else {
            for (int j = value - 1; j > 0; j--) {
                if (greed[j]) {
                    count++;
                    greed[j]--;
                    break;
                }
            }
        }
    }

    std::cout << count;
}