小明上学

#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 ta, tb;

        cin >> ta >> tb;

        if((ta == 0) || (ta == 1)){
            sum += tb;
        }
        else if(ta == 2){
            sum += (tb + r);
        }

    }

    cout << sum << endl;
           return 0;
}