#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
int n,p,a,b,num_t,t[3005],r,fa[3005]={0},exist[3005]={0},ans=0,i,j;
void input()
{
	scanf("%d%d",&n,&p);
	for(i=1;i<=p;i++)
	{
		scanf("%d",&num_t);
		scanf("%d",&t[num_t]);
	}
	scanf("%d",&r);
	for(i=1;i<=r;i++)
	{
		scanf("%d%d",&a,&b);
		fa[a]=b;//a的爸爸是b，爸爸信赖儿子 
	}
}
int main()
{
	freopen("salenet.in","r",stdin);freopen("salenet.out","w",stdout);
	memset(t,0,sizeof(t));
	input();
	for(i=1;i<=p;i++)
	  ans+=t[i];
	printf("YES\n");
	printf("%d",ans); 
}