import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.stream.IntStream;
import java.util.Arrays;
import java.util.OptionalInt;
import java.util.OptionalLong;
import java.nio.charset.Charset;
import java.util.StringTokenizer;
import java.io.OutputStreamWriter;
import java.util.NoSuchElementException;
import java.io.OutputStream;
import java.util.stream.LongStream;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UncheckedIOException;
import java.util.stream.Stream;
import java.io.Writer;
import java.io.BufferedReader;
import java.util.regex.Pattern;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author mikit
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        LightScanner in = new LightScanner(inputStream);
        LightWriter out = new LightWriter(outputStream);
        DKnapsack1 solver = new DKnapsack1();
        solver.solve(1, in, out);
        out.close();
    }

    static class DKnapsack1 {
        public void solve(int testNumber, LightScanner in, LightWriter out) {
            int n = in.ints(), m = in.ints();
            int[] w = new int[n], v = new int[n];
            in.ints(w, v);
            long[][] dp = new long[n + 1][m + 1];
            for (int i = 0; i < n; i++) {
                for (int j = 0; j <= m; j++) {
                    if (m >= w[i] + j) {
                        dp[i + 1][w[i] + j] = Math.max(dp[i + 1][w[i] + j], dp[i][j] + v[i]);
                    }
                    dp[i + 1][j] = Math.max(dp[i + 1][j], dp[i][j]);
                }
            }
            out.ans(IntMath.max(dp[n])).ln();
        }

    }

    static class LightWriter implements AutoCloseable {
        private static final String DEBUG_PROPERTY = "debug";
        private static final String DEBUG_CALL_PATTERN = "^.+\\.debug\\(([a-zA-Z0-9]+)\\);.*$";
        private static Pattern debugRegex;
        private final Writer out;
        private boolean autoflush = false;
        private boolean debug = false;
        private boolean breaked = true;
        private final String src;

        public LightWriter(Writer out) {
            this.out = out;
            src = System.getProperty(DEBUG_PROPERTY);
            if (src != null) {
                debug = true;
                if (debugRegex == null) {
                    debugRegex = Pattern.compile(DEBUG_CALL_PATTERN);
                }
            }
        }

        public LightWriter(OutputStream out) {
            this(new BufferedWriter(new OutputStreamWriter(out, Charset.defaultCharset())));
        }

        public LightWriter print(char c) {
            try {
                out.write(c);
                breaked = false;
            } catch (IOException ex) {
                throw new UncheckedIOException(ex);
            }
            return this;
        }

        public LightWriter print(String s) {
            try {
                out.write(s, 0, s.length());
                breaked = false;
            } catch (IOException ex) {
                throw new UncheckedIOException(ex);
            }
            return this;
        }

        public LightWriter ans(String s) {
            if (!breaked) {
                print(' ');
            }
            return print(s);
        }

        public LightWriter ans(long l) {
            return ans(Long.toString(l));
        }

        public LightWriter ln() {
            breaked = true;
            print(System.lineSeparator());
            if (autoflush) {
                try {
                    out.flush();
                } catch (IOException ex) {
                    throw new UncheckedIOException(ex);
                }
            }
            return this;
        }

        public void close() {
            try {
                out.close();
            } catch (IOException ex) {
                throw new UncheckedIOException(ex);
            }
        }

    }

    static final class IntMath {
        private IntMath() {
        }

        public static long max(long... v) {
            return Arrays.stream(v).max().orElseThrow(NoSuchElementException::new);
        }

    }

    static class LightScanner {
        private BufferedReader reader = null;
        private StringTokenizer tokenizer = null;

        public LightScanner(InputStream in) {
            reader = new BufferedReader(new InputStreamReader(in));
        }

        public String string() {
            if (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new UncheckedIOException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int ints() {
            return Integer.parseInt(string());
        }

        public void ints(int[]... arrays) {
            int l = Arrays.stream(arrays).mapToInt(a -> a.length).min().orElse(0);
            for (int i = 0; i < l; i++) {
                for (int j = 0; j < arrays.length; j++) {
                    arrays[j][i] = ints();
                }
            }
        }

    }
}



Measured memory_bytes: 128084