By Thobias, Fernando & Luiz, URI Brazil
Joseph is a motorcycle that works making deliveries for a pizzeria. His salary is based on the number of pizzas delivered. How this pizzeria is growing he asked his friend Roberto to help him in deliveries. Since Roberto is not working at this time, he agreed to take the worst orders (whose deliveries will be more time consuming).
So whenever they come to the pizzeria before departing for new deliveries, Joseph determines the amount of pizzas that Roberto should deliver and select that will have more time consuming. For example, if there are 22 pizzas to be delivered and Joseph determine that at most 10 of these pizzas (can be less) would be delivered by Roberto, these must necessarily be among the requests that take longer to be delivered. This is illustrated in the first test case, where Roberto will deliver the second, third and sixth order, summing 8 pizzas and 62 minutes (23 + 21 + 18). If Roberto was really deliver 10 pizzas, he would have to deliver the second, third and fourth order and it would take 59 minutes (23 + 21 + 16), which is not the goal of Joseph because in this case would be delivered more pizzas in a shorter time.
In order to make the division of this work, Joseph asked a friend in academic computer science to develop a program that would determine how long his friend Roberto will take to deliver these worst deliveries (in time consuming).
The input contains many test cases. Each test case contains in the first line an integer number N (1 ≤ N ≤ 20) that indicates the number of orders. The following line contains an integer number P (1 ≤ P ≤ 30) that indicates the maximum number of pizzas that can be delivered by Roberto. Each one of the next N lines contains a order with the total time to be delivered and the among of pizzas of this order, respectively. The end of input is represented by N = 0, and can't be processed.
For each test case, the input must be printed as an integer number that determinates the time spent by Roberto to delivery the pizzas followed by one space and the text "min.", like the given examples.
|Sample Input||Sample Output|