#include <iostream>
#include <unordered_set>
//sourcea.ir
int main() {
    int n, m;
    std::cout << "Enter the number of elements for the first array: ";
    std::cin >> n;

    std::cout << "Enter the elements of the first array: ";
    std::unordered_set<int> set1;
    for (int i = 0; i < n; i++) {
        int num;
        std::cin >> num;
        set1.insert(num);
    }

    std::cout << "Enter the number of elements for the second array: ";
    std::cin >> m;

    std::cout << "Enter the elements of the second array: ";
    std::unordered_set<int> set2;
    for (int i = 0; i < m; i++) {
        int num;
        std::cin >> num;
        set2.insert(num);
    }

    int count = 0;
    for (int num : set1) {
        if (set2.find(num) != set2.end()) {
            count++;
        }
    }

    std::cout << "The number of common elements between the two arrays is: " << count << std::endl;

    return 0;
}