Problem:
Score : 100 points

Problem Statement

There are N items, numbered 1, 2, \ldots, N.
For each i (1 \leq i \leq N), Item i has a weight of w_i and a value of v_i.

Taro has decided to choose some of the N items and carry them home in a knapsack.
The capacity of the knapsack is W, which means that the sum of the weights of items taken must be at most W.

Find the maximum possible sum of the values of items that Taro takes home.

Constraints

All values in input are integers.

1 \leq N \leq 100

1 \leq W \leq 10^5

1 \leq w_i \leq W

1 \leq v_i \leq 10^9

Input

Input is given from Standard Input in the following format:

N W
w_1 v_1
w_2 v_2
:
w_N v_N

Output

Print the maximum possible sum of the values of items that Taro takes home.

Sample Input 1

3 8
3 30
4 50
5 60

Sample Output 1

90

Items 1 and 3 should be taken.
Then, the sum of the weights is 3 + 5 = 8, and the sum of the values is 30 + 60 = 90.

Sample Input 2

5 5
1 1000000000
1 1000000000
1 1000000000
1 1000000000
1 1000000000

Sample Output 2

5000000000

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

Sample Input 3

6 15
6 5
5 6
6 4
6 6
3 5
7 2

Sample Output 3

17

Items 2, 4 and 5 should be taken.
Then, the sum of the weights is 5 + 6 + 3 = 14, and the sum of the values is 6 + 6 + 5 = 17.

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

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
    private static final BufferedReader READER = new BufferedReader(new InputStreamReader(System.in));

    private static int getInt() {
        try {
            return Integer.parseInt(READER.readLine());
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    private static int[] getIntArr(int n) {
        int[] ans = new int[n];

        StringTokenizer stringTokenizer = null;
        try {
            stringTokenizer = new StringTokenizer(READER.readLine(), " ");
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        for (int i = 0; i < n && stringTokenizer.hasMoreTokens(); i++) {
            ans[i] = Integer.parseInt(stringTokenizer.nextToken());
        }

        return ans;
    }

    private static long solve() {
        int[] nw = getIntArr(2);
        int n = nw[0];
        int w = nw[1];

        Item[] items = new Item[n];
        for (int i = 0; i < n; i++) {
            items[i] = Item.of(getIntArr(2));
        }
        return solveInternal(n, w, items);
    }

    private static long solveInternal(int n, int W, Item[] items) {
        long[][] dp = new long[n + 1][W + 1];

        for (int i = 1; i <= n; i++) {
            for (int w = 1; w <= W; w++) {
                Item item = items[i - 1];
                if (item.w > w) {
                    dp[i][w] = dp[i - 1][w];
                } else {
                    dp[i][w] = Math.max(dp[i - 1][w], dp[i - 1][w - item.w] + item.v);
                }
            }
        }

//        for (int i = 0; i <= n; i++) {
//            for (int w = 0; w <= W; w++) {
//                System.out.println(String.format("dp[%s,%s]=%s", i, w, dp[i][w]));
//            }
//        }

        return dp[n][W];
    }


    public static final class Item {
        public final int v;
        public final int w;

        private Item(int w, int v) {
            this.v = v;
            this.w = w;
        }

        public static Item of(int[] arr) {
            return new Item(arr[0], arr[1]);
        }
    }

    public static void main(String... args) {
        System.out.println(solve());
//        System.out.println(
//                solveInternal(6, 5, new Item[]{
//                        new Item(1, 1000000000),
//                        new Item(1, 1000000000),
//                        new Item(1, 1000000000),
//                        new Item(1, 1000000000),
//                        new Item(1, 1000000000)
//                })
//        );
    }
}