import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int red = sc.nextInt();
        int yellow = sc.nextInt();
        int green = sc.nextInt();
        int num = sc.nextInt();
        int sum = 0;
        for(int i = 0; i < num; i++){
            int type = sc.nextInt();
            int s = sc.nextInt();
            if(type == 0){
                sum += s;
            }
            if(type == 1){
                sum += s;
            }
            if(type == 2){
                sum += s+red;
            }
        }
        System.out.print(sum);
    }
}