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 10^9

1 \leq w_i \leq W

1 \leq v_i \leq 10^3

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

1 1000000000
1000000000 10

Sample Output 2

10

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 C# (Mono 4.6.2.0) (judge verdict: Runtime Error)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using static System.Console;
using static System.Math;

namespace atcoder
{
    class Program
    {
        static void Main(string[] args)
        {
                new Program().Solve(new ConsoleInput(In));
        }

        public T Min<T>(params T[] a)
        {
            if (a.Length == 0) return default(T);

            T min = a[0];
            for (int i = 1; i < a.Length; i++)
            {
                if ((dynamic)min > (dynamic)a[i]) min = a[i];
            }
            return min;
        }

        public T Max<T>(params T[] a)
        {
            if (a.Length == 0) return default(T);

            T max = a[0];
            for (int i = 1; i < a.Length; i++)
            {
                if ((dynamic)max < (dynamic)a[i]) max = a[i];
            }
            return max;
        }

        public T Lcm<T>(T a, T b)
        {
            return (dynamic)a * (dynamic)b / Gcd((dynamic)a, (dynamic)b);
        }

        public T Gcd<T>(T a, T b)
        {
            if ((dynamic)a < (dynamic)b)
                return Gcd(b, a);
            while ((dynamic)b != 0)
            {
                var remainder = (dynamic)a % (dynamic)b;
                a = b;
                b = remainder;
            }
            return a;
        }

        public void Solve(ConsoleInput input)
        {
            var N = input.ReadLong;
            var W = input.ReadLong;
            var w = new int[N];
            var v = new int[N];
            for (var i = 0; i < N; i++)
            {
                w[i] = input.ReadInt;
                v[i] = input.ReadInt;
            }

            var dp = new int[W + 1];
            for (var i = 0; i < N; i++)
            {
                for (var j = W; j >= w[i]; j--)
                {
                    dp[j] = Max(dp[j], dp[j - w[i]] + v[i]);
                }
            }
            WriteLine($"{dp[W]}");
        }
    }

    public class ConsoleInput
    {
        private readonly System.IO.TextReader _stream;
        private readonly char _separator;
        private Queue<string> inputStream;
        public ConsoleInput(System.IO.TextReader stream, char separator = ' ')
        {
            _separator = separator;
            _stream = stream;
            inputStream = new Queue<string>();
        }
        public string Read
        {
            get
            {
                if (inputStream.Count != 0) return inputStream.Dequeue();
                string[] tmp = _stream.ReadLine().Split(_separator);
                for (int i = 0; i < tmp.Length; ++i)
                    inputStream.Enqueue(tmp[i]);
                return inputStream.Dequeue();
            }
        }
        public string ReadLine { get { return _stream.ReadLine(); } }
        public int ReadInt { get { return int.Parse(Read); } }
        public long ReadLong { get { return long.Parse(Read); } }
        public double ReadDouble { get { return double.Parse(Read); } }
        public string[] ReadStrArray(long N) { var ret = new string[N]; for (long i = 0; i < N; ++i) ret[i] = Read; return ret; }
        public int[] ReadIntArray(long N) { var ret = new int[N]; for (long i = 0; i < N; ++i) ret[i] = ReadInt; return ret; }
        public long[] ReadLongArray(long N) { var ret = new long[N]; for (long i = 0; i < N; ++i) ret[i] = ReadLong; return ret; }
    }
}