#region using
using System;
using System.Collections.Generic;
using System.Linq;
using IEnumerable = System.Collections.IEnumerable;
using IEnumerator = System.Collections.IEnumerator;
using BitArray = System.Collections.BitArray;
using BigInteger = System.Numerics.BigInteger;
using TextReader = System.IO.TextReader;
using System.Text;
#endregion

namespace AtCoderProject
{
    public class Program
    {
        public object Calc()
        {
            var N = consoleReader.Int;
            var W = consoleReader.Int;

            var goods = consoleReader.Repeat(N).Select(cr => new Goods { weight = cr.Int, value = cr.Int }).ToArray();
            long weight1 = goods[0].weight;

            var values = Enumerable.Repeat(Array.Empty<int>(), 4).ToArray();

            foreach (var g in goods.GroupBy(g => g.weight - weight1, g => g.value))
            {
                values[g.Key] = g.OrderByDescending(i => i).ToArray();
            }


            var sums = new int[4][];
            for (int i = 0; i < 4; i++)
            {
                sums[i] = new int[values[i].Length + 1];
                for (int j = 0; j < values[i].Length; j++)
                    sums[i][j + 1] = sums[i][j] + values[i][j];
            }

            long max = 0;
            for (int w0 = 0; w0 < sums[0].Length; w0++)
                for (int w1 = 0; w1 < sums[1].Length; w1++)
                    for (int w2 = 0; w2 < sums[2].Length; w2++)
                    {
                        long weightSum = weight1 * (w0 + w1 + w2) + w1 + 2 * w2;
                        if (weightSum > W) continue;
                        int w3 = Math.Min((int)((W - weightSum) / (weight1 + 3)), values[3].Length);
                        max = Math.Max(max, +sums[0][w0] + sums[1][w1] + sums[2][w2] + sums[3][w3]);
                    }
            return max;
        }
        struct Goods
        {
            public int weight;
            public int value;
        }

        #region いつもの
#pragma warning disable
        private ConsoleReader consoleReader;
        public Program(ConsoleReader consoleReader) { this.consoleReader = consoleReader; }
        static void Main() => Console.WriteLine(new Program(new ConsoleReader(Console.In)).Calc()); static string AllLines<T>(IEnumerable<T> source) => string.Join("\n", source);
    }
    static class Ext
    {
        public static Dictionary<TKey, int> GroupCount<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector) => source.GroupBy(keySelector).ToDictionary(g => g.Key, g => g.Count());
        public static Dictionary<TKey, int> GroupCount<TKey>(this IEnumerable<TKey> source) => source.GroupCount(i => i);
    }
    public class ConsoleReader { private string[] ReadLineSplit() => textReader.ReadLine().Split(Array.Empty<char>(), StringSplitOptions.RemoveEmptyEntries); private string[] line = Array.Empty<string>(); private int linePosition; private TextReader textReader; public ConsoleReader(TextReader tr) { textReader = tr; } public int Int => int.Parse(String); public long Long => long.Parse(String); public double Double => double.Parse(String); public string String { get { if (linePosition >= line.Length) { linePosition = 0; line = ReadLineSplit(); } return line[linePosition++]; } } public class SplitLine { private string[] splited; public SplitLine(ConsoleReader cr) { splited = cr.ReadLineSplit(); cr.line = Array.Empty<string>(); } public int[] Int => String.Select(x => int.Parse(x)).ToArray(); public int[] Int0 => String.Select(x => int.Parse(x) - 1).ToArray(); public long[] Long => String.Select(x => long.Parse(x)).ToArray(); public double[] Double => String.Select(x => double.Parse(x)).ToArray(); public string[] String => splited; } public SplitLine Split => new SplitLine(this); public class RepeatReader : IEnumerable<ConsoleReader> { ConsoleReader cr; int count; public RepeatReader(ConsoleReader cr, int count) { this.cr = cr; this.count = count; } public IEnumerator<ConsoleReader> GetEnumerator() => Enumerable.Repeat(cr, count).GetEnumerator(); System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() => GetEnumerator(); public IEnumerable<string> String => this.Select(cr => cr.String); public IEnumerable<int> Int => this.Select(cr => cr.Int); public IEnumerable<int> Int0 => this.Select(cr => cr.Int - 1); public IEnumerable<long> Long => this.Select(cr => cr.Long); public IEnumerable<double> Double => this.Select(cr => cr.Double); } public RepeatReader Repeat(int count) => new RepeatReader(this, count); }
    #endregion
}


Measured memory_bytes: 13780