#include <iostream>
using namespace std;
typedef long long ll;
int main(){
    ll r, y, g;    cin >> r >> y >> g;
    int T;  cin >> T;
    ll res = 0;
    while(T -- ){
        int op, t;  cin >> op >> t;
        if(op == 0) res += t;
        if(op == 1) res += t;
        else if(op == 2)    res += t + r;
    }
    cout << res << endl;
    return 0;
}