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

using namespace std;

int main() {
    int n, num, m, cut = 0;
    vector<int> a;
    set<int> b, d;
    ifstream inp("input.txt");
    inp >> n;
    for (int i = 0; i < n; ++i) {
        inp >> num;
        a.push_back(num);
    }
    inp >> m;
    for (int i = 0; i < m; ++i) {
        inp >> num;
        b.insert(num);
    }
    inp.close();

    for (int i = 0; i < n; ++i) {
        if (b.find(a[i]) != b.end()) {
            d.insert(a[i]);
        }
        if (d.size() >= m) {
            cut++;
            d.clear();
            d.insert(a[i]);
        }
    }
    ofstream out("output.txt");
    out << cut;
    out.close();
    return 0;
}