using System;
using System.Collections.Generic;
using System.Linq;
using static System.Console;
using static System.Math;

class MainClass : Scanner
{
    static void Main()
    {
        var (N, T) = ReadStream<int, int>();
        var ab = new (long a, long b)[N];
        for (int i = 0; i < N; i++)
        {
            ab[i] = ReadStream<long, long>();
        }
        Array.Sort(ab, (x, y) => x.a.CompareTo(y.a));
        var dp = new long[N + 1, T + 1];
        for (int i = 0; i < N+1; i++)
        {
            for (int j = 0; j < T+1; j++)
            {
                dp[i, j] = -1;
            }
        }
        dp[0, 0] = 0;

        for (int i = 0; i < N; i++)
        {
            for (int j = T; j >= 0; j--)
            {
                dp[i + 1, j] = Max(dp[i + 1, j], dp[i, j]);

                if (dp[i, j] == -1||j==T) continue;
                var nt = j + ab[i].a;
                nt = Min(nt, T);
                var nx = dp[i, j] + ab[i].b;
                dp[i + 1, nt] = Max(dp[i + 1, nt], nx);
                
            }
        }
        long ans = 0;
        for (int i = 0; i < T+1; i++)
        {
            ans = Max(ans, dp[N, i]);
        }
        WriteLine(ans);
    }
}

class Scanner
{
    public static int RInt() => int.Parse(Console.ReadLine());
    public static long RLong() => long.Parse(Console.ReadLine());
    public static string RString() => Console.ReadLine();
    public static double RDouble() => double.Parse(Console.ReadLine());

    public static int[] RInts() => Array.ConvertAll(Console.ReadLine().Split(), int.Parse);
    public static int[] RInts(Func<string, int> func) => Console.ReadLine().Split().Select(func).ToArray();
    public static long[] RLongs() => Array.ConvertAll(Console.ReadLine().Split(), long.Parse);
    public static long[] RLongs(Func<string, long> func) => Console.ReadLine().Split().Select(func).ToArray();
    public static double[] RDoubles() => Array.ConvertAll(Console.ReadLine().Split(), double.Parse);
    public static double[] RDoubles(Func<string, double> func) => Console.ReadLine().Split().Select(func).ToArray();
    public static string[] RStrings() => Console.ReadLine().Split();
    //public static string[] RStrings(Func<string, string> func) => Console.ReadLine().Split().Select(func).ToArray();
    public static T1 ReadStream<T1>()
    {
        var r = RStrings();
        var r1 = (T1)Convert.ChangeType(r[0], typeof(T1));
        return r1;
    }
    public static (T1, T2) ReadStream<T1, T2>()
    {
        var r = RStrings();
        var r1 = (T1)Convert.ChangeType(r[0], typeof(T1));
        var r2 = (T2)Convert.ChangeType(r[1], typeof(T2));
        return (r1, r2);
    }
    public static (T1, T2, T3) ReadStream<T1, T2, T3>()
    {
        var r = RStrings();
        var r1 = (T1)Convert.ChangeType(r[0], typeof(T1));
        var r2 = (T2)Convert.ChangeType(r[1], typeof(T2));
        var r3 = (T3)Convert.ChangeType(r[2], typeof(T3));
        return (r1, r2, r3);
    }
    public static (T1, T2, T3, T4) ReadStream<T1, T2, T3, T4>()
    {
        var r = RStrings();
        var r1 = (T1)Convert.ChangeType(r[0], typeof(T1));
        var r2 = (T2)Convert.ChangeType(r[1], typeof(T2));
        var r3 = (T3)Convert.ChangeType(r[0], typeof(T3));
        var r4 = (T4)Convert.ChangeType(r[0], typeof(T4));
        return (r1, r2, r3, r4);
    }
}

Measured memory_bytes: 98492