小明上学201812-1

#include<iostream>
using namespace std;
int main()
{
    int r,y,g;
    cin>>r>>y>>g;
    int n;
    cin>>n;
    int sum=0;
    for(int i=0;i<n;i++)
    {
        int x,y;
        cin>>x>>y;
        switch(x)
        {
            case 0:sum+=y;break;
            case 1:sum+=y;break;
            case 2:sum+=y+r;break;
            case 3:sum+=0;break;
            default:break;
        }    
    }
    cout<<sum;
    
    return 0;
}