#include <bits/stdc++.h>
using namespace std;

ifstream fin("ubuntzei.in");
ofstream fout("ubuntzei.out");

int main() {
    int n, m;
    fin >> n >> m;
    int k;
    fin >> k;
    for (int i = 0 ; i < k; ++i) {
        int c;
        fin >> c;
    }
    for (int i = 0; i < m; ++i) {
        int x, y, z;
        fin >> x >> y >> z;
    }
    fout << n;
    return 0;
}