18-12-01（小明上学）

package csp;

import java.util.Scanner;
public class csp_18_12_01 {
    
    
	
	public static void main(String[] args){
    
    
	  Scanner in = new Scanner(System.in);
	  int r =  in.nextInt();
	  int y = in.nextInt();
	  int g =  in.nextInt();
	  int n = in.nextInt();
	  int result = 0;
     for(int i =0;i<n;i++) {
    
    
	int a = in.nextInt();
	int b = in.nextInt();
	if(a==0 || a==1) result += b;
	if(a==2)  result += b+r;
}
	  
System.out.print(result);
	  
	}
}