#include <iostream>
#include <map>
#include <cstring>
using namespace std;
#define ll long long
ll n, a, b;
map<ll, ll> u, v;
long long int sum = 0;

int main() {
    scanf("%lld%lld%lld", &n, &a, &b);
    for (int i = 1; i <= a; i++) {
        ll index, value;
        scanf("%lld%lld", &index, &value);
        u[index] = value;
    }
    for (int i = 1; i <= b; i++) {
        ll index, value;
        scanf("%lld%lld", &index, &value);
        v[index] = value;
    }
    map<ll, ll>::iterator u1, v1;
    u1 = u.begin();
    v1 = v.begin();
    while (u1 != u.end() && v1 != v.end()) {
        ll x1 = u1->first, y1 = u1->second, x2 = v1->first, y2 = v1->second;
        if (x1 < x2) {
            u1++;
            continue;
        } else if (x1 > x2) {
            v1++;
            continue;
        } else {
            sum += y1 * y2;
            u1++;
            v1++;
        }
    }
    cout << sum << endl;
    return 0;
}