// LM10: The next Ballon d'Or
import java.util.*;
import java.io.*;
import java.math.*;
import static java.lang.Math.*;
public class Main
{
    static class FastReader
    {
        private InputStream mIs;private byte[] buf = new byte[1024];private int curChar,numChars;public FastReader() { this(System.in); }public FastReader(InputStream is) { mIs = is;}
        public int read() {if (numChars == -1) throw new InputMismatchException();if (curChar >= numChars) {curChar = 0;try { numChars = mIs.read(buf);} catch (IOException e) { throw new InputMismatchException();}if (numChars <= 0) return -1; }return buf[curChar++];}
        public String nextLine(){int c = read();while (isSpaceChar(c)) c = read();StringBuilder res = new StringBuilder();do {res.appendCodePoint(c);c = read();}while (!isEndOfLine(c));return res.toString() ;}
        public String next(){int c = read();while (isSpaceChar(c)) c = read();StringBuilder res = new StringBuilder();do {res.appendCodePoint(c);c = read();}while (!isSpaceChar(c));return res.toString();}
        public long l(){int c = read();while (isSpaceChar(c)) c = read();int sgn = 1;if (c == '-') { sgn = -1 ; c = read() ; }long res = 0; do{ if (c < '0' || c > '9') throw new InputMismatchException();res *= 10 ; res += c - '0' ; c = read();}while(!isSpaceChar(c));return res * sgn;}
        public int i(){int c = read() ;while (isSpaceChar(c)) c = read();int sgn = 1;if (c == '-') { sgn = -1 ; c = read() ; }int res = 0;do{if (c < '0' || c > '9') throw new InputMismatchException();res *= 10 ; res += c - '0' ; c = read() ;}while(!isSpaceChar(c));return res * sgn;}
        public double d() throws IOException {return Double.parseDouble(next()) ;}
        public boolean isSpaceChar(int c) { return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1; }
        public boolean isEndOfLine(int c) { return c == '\n' || c == '\r' || c == -1; }
        public void scanIntArr(int [] arr){ for(int li=0;li<arr.length;++li){ arr[li]=i();}}
        public void scanLongArr(long [] arr){for (int i=0;i<arr.length;++i){arr[i]=l();}}
        public void shuffle(int [] arr){ for(int i=arr.length;i>0;--i) { int r=(int)(Math.random()*i); int temp=arr[i-1]; arr[i-1]=arr[r]; arr[r]=temp; } }
    }
    public static void main(String[] args)throws IOException {
        /*
Sample Input 1
Copy
3 8
3 30
4 50
5 60
Sample Output 1
Copy
90
        */
        PrintWriter pw = new PrintWriter(System.out);
        FastReader fr = new FastReader();
        int t=1;
        for(int ti=0;ti<t;++ti)
        {
            int n=fr.i();
            int w=fr.i();
            int [] weights=new int[n];
            int [] values=new int[n];
            for(int ni=0;ni<n;++ni)
            {
                weights[ni]=fr.i();
                values[ni]=fr.i();
            }
            long [][] dp=new long[n][w+1];
            for(int ni=0;ni<n;++ni)
                dp[ni][0]=0;
            for(int ni=0;ni<n;++ni)
            {
                for(int wi=1;wi<=w;++wi)
                {
                    if(weights[ni]>wi && ni==0)
                    {
                        dp[ni][wi]=0;
                        continue;
                    }
                    if(weights[ni]>wi)
                    {
                        dp[ni][wi]=dp[ni-1][wi];
                    }
                    else
                    {
                        //System.out.println("ni="+ni+" wi="+wi);
                        if(ni==0)
                        {
                            dp[ni][wi]=values[ni];
                            continue;
                        }
                        dp[ni][wi]=max((long)values[ni]+dp[ni-1][wi-weights[ni]],dp[ni-1][wi]);
                    }
                }
            }
            pw.println(dp[n-1][w]);
        }

        pw.flush();
        pw.close();
    }
}

Measured memory_bytes: 127096