#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;
int main()
{
    int r, y, g;
    cin >> r >> y >> g;
    int n;
    cin >> n;
    int res = 0;
    while (n -- )
    {
        int k, t;
        cin >> k >> t;
        if (!k) res += t;
        else if (k == 1) res += t;
        else if (k == 2) res += t + r;
    }
    cout << res << endl;
    return 0;
}