Chef went to a shop and buys a pens and b pencils. Each pen costs x units and each pencil costs y units. Now find what is the total amount Chef will spend to buy a pens and b pencils.
#include <iostream>
using namespace std;
int main()
{
int a, b, x, y, cost = 0;
cin >> a;
cin >> b;
cin >> x;
cin >> y;
cost = a * x + b * y;
cout << cost;
}
