import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int cities = in.nextInt();
		for(int i=0;i<cities;i++){
			Integer town = in.nextInt();
			Integer population = in.nextInt();
			townPopulation.put(town, population);
			//townClouds.put(town, 0);
		}
		//System.out.println(townPopulation.keySet());
		towns = new ArrayList<>(townPopulation.keySet());
		int clouds = in.nextInt();
		int maxCoverage = 0;
		
		for(int j=0;j<clouds;j++){
			int cloudPosition = in.nextInt();
			int cloudCoverage = in.nextInt();
			int cloudStart = cloudPosition - cloudCoverage;
			int cloudEnd = cloudPosition + cloudCoverage;
			int i=0;
			int townIndex = -1;
			for( i = cloudStart;i<=cloudEnd;i++){
				if(towns.contains(i)){
					townIndex = towns.indexOf((Integer) i);
					break;
				}
			}
			townIndex++;
			int town = i;
			int currentCoverage = 0;
			ArrayList<Integer> townList = new ArrayList<>();
			while(town<=cloudEnd){
				int count = townClouds.containsKey(town) ? townClouds.get(town) + 1 : 1;
				townClouds.put(town, count);
				town = towns.get(townIndex++);
				
				currentCoverage++;
			}	
			
			if(currentCoverage > maxCoverage){
				maxCoverage = currentCoverage;
			}
		}
		
		int sunnyPeople = 0;
		for(Map.Entry<Integer, Integer> town : townPopulation.entrySet()){
			if(townClouds.containsKey(town.getKey())){
				
			}else{
				sunnyPeople = town.getValue();
			}
		}
		
		int sCount = 0;
		int sMax = 0;
		for(Map.Entry<Integer, Integer> townCloud : townClouds.entrySet()){
			if(townCloud.getValue() == 1){
				sCount+= townPopulation.get(townCloud.getKey());
				if(sCount>sMax){
					sMax = sCount;
				}
			}else{				
				sCount = 0;
			}
			
		}
		
		System.out.println(sunnyPeople+sMax);
		
		
		
		
		//int freeTowns = town
		
	}

	static ArrayList<Integer> towns;
	static HashMap<Integer, ArrayList<Integer>> cloudTownsMap = new LinkedHashMap<>();
	static TreeMap<Integer, Integer> townClouds = new TreeMap();
	static TreeMap<Integer, Integer> townPopulation = new TreeMap();
	static TreeMap<Integer, Integer> cloudCoverage = new TreeMap();
}