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 sn = new Scanner(System.in);
        int n = sn.nextInt();
        int m = sn.nextInt();

        int[][] priceList = new int[n][2];
        for (int i = 0; i < n; i++){
            priceList[i][0] = sn.nextInt();
            priceList[i][1] = sn.nextInt();
        }
        
        Arrays.sort(priceList, (l,r) -> {return l[0] - r[0];});
        
        long sum = 0;
        for (int[] price : priceList){
            if(m - price[1] >= 0) {
                sum += (long)price[0] * price[1];
                m -= price[1];
            } else {
                sum += (long)price[0] * m;
                break;
            }
        }
        
        System.out.println(sum);
    }
}