Problem:
Score : 300 points

Problem Statement

Hearing that energy drinks increase rating in those sites, Takahashi decides to buy up M cans of energy drinks.

There are N stores that sell energy drinks. In the i-th store, he can buy at most B_i cans of energy drinks for A_i yen (the currency of Japan) each.

What is the minimum amount of money with which he can buy M cans of energy drinks?

It is guaranteed that, in the given inputs, a sufficient amount of money can always buy M cans of energy drinks.

Constraints

All values in input are integers.

1 \leq N, M \leq 10^5

1 \leq A_i \leq 10^9

1 \leq B_i \leq 10^5

B_1 + ... + B_N \geq M

Input

Input is given from Standard Input in the following format:

N M
A_1 B_1
A_2 B_2
\vdots
A_N B_N

Output

Print the minimum amount of money with which Takahashi can buy M cans of energy drinks.

Sample Input 1

2 5
4 9
2 4

Sample Output 1

12

With 12 yen, we can buy one drink at the first store and four drinks at the second store, for the total of five drinks. However, we cannot buy 5 drinks with 11 yen or less.

Sample Input 2

4 30
6 18
2 5
3 10
7 9

Sample Output 2

130

Sample Input 3

1 100000
1000000000 100000

Sample Output 3

100000000000000

The output may not fit into a 32-bit integer type.

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		long m = sc.nextInt();
		PriorityQueue<Shop> queue = new PriorityQueue<>();
		for (int i = 0; i < n; i++) {
		    queue.add(new Shop(sc.nextInt(), sc.nextInt()));
		}
		long total = 0;
		while (queue.size() > 0 && m > 0) {
		    Shop s = queue.poll();
		    total += s.price * Math.min(m, s.count);
		    m -= s.count;
		}
		System.out.println(total);
   }
   
   static class Shop implements Comparable<Shop> {
       int price;
       int count;
       
       public Shop (int price, int count) {
           this.price = price;
           this.count = count;
       }
       
       public int compareTo(Shop another) {
           return price - another.price;
       }
   }
}