#include<iostream>
#include<algorithm>
#include<cstring>

using namespace std;

int r,y,g;
int n;

int main()
{
    cin>>r>>y>>g;
    cin>>n;
    int ans = 0;
    while(n--)
    {
        int k,t;
        cin>>k>>t;
        if(k==1) ans+=t;
        else if(k==2) ans+=t+r;
        else if(k==0) ans+=t;
    }
    cout<<ans;
    return 0;
}