#include <cmath>
#include <iomanip>
#include <iostream>
using namespace std;
double price(int id){
	switch (id){
		case 1: return 2.98;
		case 2: return 4.50;
		case 3: return 9.98;
		case 4: return 4.49;
		case 5: return 6.87;
		default: return 0;
	}
}
int main(){
	setlocale(LC_ALL, "Russian");
	int count;
	cout << "Общее количество продаж: ", cin >> count;
	double total = 0;
	for(int i = 0, id, cnt; i++ < count; total += price(id) * cnt)
		cout << "Продажа №" << setw((int)log10(count) + 1) << i << ": ", cin >> id >> cnt;
	cout << "Общая стоимость: $" << total << endl;
	cin.ignore();
	cin.get();
	return 0;
}

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MwoyIDMKMyAxCjQgMgo=

3
2 3
3 1
4 2