#include <iostream>
#include <string>
#include <vector>
#include <map>
#include <cstring>
#include <functional>


struct action
{
	uint64_t name;
	int power;
	action( uint64_t n, int p )
	{
		name = n; power = p;
	}
};

inline int calculate_score( const std::vector<action>& actions, const std::vector<action>& events )
{
	int score = 0;
	for( const action& rAction : actions ) {
		for( const action& rEvent : events ) {
			if( rAction.name != rEvent.name )
				continue;
			if( rAction.power > rEvent.power )
				score += rAction.power;
		}
	}

	return score;
}

int main()
{
	int n, k;
	std::cin >> n; std::cin >> k;
	std::vector<action> action_list;
	action_list.reserve( n );
	char name[21];
	int power;
	for( int i = 0; i < n; i++ ) {

		std::cin >> name; std::cin >> power;
		action_list.emplace_back( std::hash<std::string>{}( name ), power );
	}

	int l;
	std::cin >> l;
	std::vector<action> event_list;

	event_list.reserve( l );


	for( int i = 0; i < l; i++ ) {
		char name[21];
		std::cin >> name; std::cin >> power;
		event_list.emplace_back( std::hash<std::string>{}( name ), power );
	}

	for( action& rAction : action_list ) {
		for( const action& rEvent : event_list ) {
			if( rAction.name != rEvent.name )
				continue;
			if( rAction.power < rEvent.power ) {
				int delta = rEvent.power - rAction.power;
				rAction.power += delta;
				k -= delta;
				if( k < 0 ) {
					std::cout << 0;
					return 0;
				}
			}
		}
	}

	int max_score = 0;

	while( k ) {
		int target_index = 0;
		max_score = -1;
		for( int i = 0; i < n; i++ ) {
			action_list[i].power++;
			int score = calculate_score( action_list, event_list );
			if( score > max_score ) {
				target_index = i;
				max_score = score;
			}
			action_list[i].power--;
		}
		action_list[target_index].power++;
		k--;
	}

	std::cout << max_score;

	return 0;
}