import java.util.Scanner;
public class T3{
public static void main(String[] args) {
int r=0,y=0,g=0,n=0,k=0,t=0;
int sum=0;
Scanner sc = new Scanner(System.in);
r = sc.nextInt();
y = sc.nextInt();
g = sc.nextInt();
n = sc.nextInt();
while(n>0) {
k=sc.nextInt();
t=sc.nextInt();
if(k==2) sum = sum+t+r;
else if(k==3) sum = sum;
else sum = sum+t;
n--;
}
sc.close();
System.out.println(sum);
}
}