import java.util.Arrays; public class Main { private static void solve() { int n = ni(); int k = ni(); int[][] p = ntable(n, 2); Arrays.sort(p, (o1, o2) -> o2[0] - o1[0]); int[][][] dp = new int[2][k + 1][2]; for (int[][] v : dp) for (int[] u : v) Arrays.fill(u, Integer.MIN_VALUE / 2); dp[0][k][0] = 0; for (int i = 0; i < n; i++) { int from = i % 2; int to = from ^ 1; int x = p[i][0]; int y = p[i][1]; for (int j = 0; j <= k; j++) { dp[to][j][0] = Math.max(dp[from][j][0], dp[from][j][1] + y); if (j + x <= k) dp[to][j][1] = Math.max(dp[from][j][1], dp[from][j + x][0] + y); else { dp[to][j][1] = dp[from][j][1]; } } } int ret = 0; for (int s = 0; s <= k; s++) { ret = Math.max(ret, dp[n % 2][s][0]); ret = Math.max(ret, dp[n % 2][s][1]); } System.out.println(ret); } public static void main(String[] args) { new Thread(null, new Runnable() { @Override public void run() { long start = System.currentTimeMillis(); String debug = args.length > 0 ? args[0] : null; if (debug != null) { try { is = java.nio.file.Files.newInputStream(java.nio.file.Paths.get(debug)); } catch (Exception e) { throw new RuntimeException(e); } } reader = new java.io.BufferedReader(new java.io.InputStreamReader(is), 32768); solve(); out.flush(); tr((System.currentTimeMillis() - start) + "ms"); } }, "", 64000000).start(); } private static java.io.InputStream is = System.in; private static java.io.PrintWriter out = new java.io.PrintWriter(System.out); private static java.util.StringTokenizer tokenizer = null; private static java.io.BufferedReader reader; public static String next() { while (tokenizer == null || !tokenizer.hasMoreTokens()) { try { tokenizer = new java.util.StringTokenizer(reader.readLine()); } catch (Exception e) { throw new RuntimeException(e); } } return tokenizer.nextToken(); } private static double nd() { return Double.parseDouble(next()); } private static long nl() { return Long.parseLong(next()); } private static int[] na(int n) { int[] a = new int[n]; for (int i = 0; i < n; i++) a[i] = ni(); return a; } private static char[] ns() { return next().toCharArray(); } private static long[] nal(int n) { long[] a = new long[n]; for (int i = 0; i < n; i++) a[i] = nl(); return a; } private static int[][] ntable(int n, int m) { int[][] table = new int[n][m]; for (int i = 0; i < n; i++) { for (int j = 0; j < m; j++) { table[i][j] = ni(); } } return table; } private static int[][] nlist(int n, int m) { int[][] table = new int[m][n]; for (int i = 0; i < n; i++) { for (int j = 0; j < m; j++) { table[j][i] = ni(); } } return table; } private static int ni() { return Integer.parseInt(next()); } private static void tr(Object... o) { if (is != System.in) System.out.println(java.util.Arrays.deepToString(o)); } }