import sys
from io import StringIO
import unittest
import os

# 再帰処理上限(dfs作成時に設定するのが面倒なので限度近い値を組み込む)
sys.setrecursionlimit(999999999)


# youk_library(debug)
def list_to_tsv_string(target: [], limit_row: int = 0, limit_column: int = 0):
    import csv

    # 行列を制限内に縮める
    if limit_row is not 0:
        target = target[:limit_row]
    if limit_column is not 0:
        target = [i[:limit_column] for i in target]

    # 行番号、列番号を追加
    # 行番号
    target = [[cnt] + i for cnt, i in enumerate(target)]
    # 列番号
    work = [i for i in range(len(target[0]))]
    target.insert(0, work)
    # tsv出力
    with open("temp.txt", "w", newline="") as f:
        writer = csv.writer(f, delimiter="\t")
        writer.writerows(target)


# 実装を行う関数
def resolve(test=""):
    try:
        # 入力の取得
        n, t = map(int, input().split())
        ab_s = [list(map(int, input().split())) for i in range(n)]

        # ------------
        # DP準備
        # ------------
        # DPの鉄則1? 「カスタム添え字として使用する」要素でソート。
        #   ->本問題の場合、カスタム添え字は「使用する時間」。この昇順でソート。
        ab_s.sort(key=lambda xx: [xx[0]])

        # DPの鉄則2?「DP対象のリスト[0]に添字調整用のダミーを追加。
        #   ->先頭から1つ選ぶ=ab_s[1]という風に、直観的に扱えるようになる。
        ab_s = [[0, 0]] + ab_s

        # DP配列の作成。
        # dp[0][使用する時間(累計):0~6000] = おいしさの最大値(-1=存在しないパターン)
        dp = [[-1 for j in range(6000 + 1)]]

        # DP配列の初期化。(何も選ばない場合の値をセット) ※ここは問題により固有※
        # 今回は・・料理を何も食べない=おいしさ0
        dp[0][0] = 0

        # ------------
        # DP
        # ------------
        # 先頭からi個選ぶループ
        for i in range(1, 999999999):

            # 次の行を追加(前の行を複写して追加) ※適時append()すると見やすい。
            dp.append(dp[i - 1].copy())

            # 最後の要素まで検証したならDP終了
            if len(ab_s) <= i:
                break

            # 検証対象の情報を取り出し ※ここは問題により固有※
            time, delicious = ab_s[i]

            # カスタム添え字ループ
            for j in range(999999999):

                # 制限時間を超えたら要素の検証を終える。次の要素へ。 ※ここは問題ごとに設定※
                if j > t - 1:
                    break

                # 値が0未満は「存在しないパターン」なので検証しない。
                if dp[i][j] < 0:
                    continue

                # 最適解を取得 ※ここは問題ごとに設定※
                val = max(dp[i][j + time], dp[i - 1][j] + delicious)

                # 最適解を反映 ※ここは問題ごとに設定※
                dp[i][j + time] = val

        # ------------
        # 結果を出力
        # ------------
        print(max(dp[i]))

    except IndexError as err:
        print("インデックスエラー:", err.args[0])


# テストクラス
class TestClass(unittest.TestCase):
    def assertIO(self, assert_input, output):
        stdout, sat_in = sys.stdout, sys.stdin
        sys.stdout, sys.stdin = StringIO(), StringIO(assert_input)
        resolve(sys._getframe().f_back.f_code.co_name)
        sys.stdout.seek(0)
        out = sys.stdout.read()[:-1]
        sys.stdout, sys.stdin = stdout, sat_in
        self.assertEqual(out, output)

    # 自作テストパターン
    def test_original1(self):
        test_input = """3 10
1 10
3000 20
1 20"""
        output = """50"""
        self.assertIO(test_input, output)

    def test_original2(self):
        test_input = """2 10
9 1
3000 3000"""
        output = """3001"""
        self.assertIO(test_input, output)

    def test_original3(self):
        test_input = """3000 3000
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1 1
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1 1
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1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1"""
        output = """5999"""
        self.assertIO(test_input, output)

    def test_input_1(self):
        test_input = """2 60
10 10
100 100"""
        output = """110"""
        self.assertIO(test_input, output)

    def test_input_2(self):
        test_input = """3 60
10 10
10 20
10 30"""
        output = """60"""
        self.assertIO(test_input, output)

    def test_input_3(self):
        test_input = """3 60
30 10
30 20
30 30"""
        output = """50"""
        self.assertIO(test_input, output)

    def test_input_4(self):
        test_input = """10 100
15 23
20 18
13 17
24 12
18 29
19 27
23 21
18 20
27 15
22 25"""
        output = """145"""
        self.assertIO(test_input, output)


# 実装orテストの呼び出し
if __name__ == "__main__":
    if os.environ.get("USERNAME") is None:
        # AtCoder提出時の場合
        resolve()

    else:
        # 自PCの場合
        unittest.main(verbosity=2)


Measured memory_bytes: 217772