#include <iostream>
using std::cout;
using std::cin;

int main()
{
    int lineAmount, discountCategory, i = 0, price, category, amount;
    float discount, summary = 0;

    cin >> lineAmount >> discountCategory >> discount;
    for (; i < lineAmount; i++)
    {
        cin >> price >> category >> amount;
        summary += (category == discountCategory ? price - price * discount : price) * amount;
    }
    cout << static_cast<int>(summary);
    return 0;
}