#include "bits/stdc++.h"
#define is ios::sync_with_stdio(false); cin.tie(0); cout.tie(0)
typedef long long ll;
using namespace std;

int n, r, p;
ll res;
unordered_map<int, int> a, b;

int main() {
    is;
    cin >> n >> r >> p;

    for (int i = 0; i < r; i ++) {
        int x, y;
        cin >> x >> y;
        a[x] = y;
    }
    for (int i = 0; i < p; i ++) {
        int x, y;
        cin >> x >> y;
        b[x] = y;
    }

    if (a.size() > b.size()) swap(a, b);

    for (auto& [idx, val] : a) {
        if (b.count(idx)) res += 1LL * val * b[idx];
    }
    cout << res;
    return 0;
}