#include <iostream>
#include <fstream>
#include <cstring>
#include <string>
#include <climits>
#include <algorithm>
#include <cmath>
using namespace std;

ifstream fin ("rucsac.in" );
ofstream fout("rucsac.out");
#define baza 1
#define MAX 2000004
#define MOD 9973
typedef long long int lli;


int n,t,s,i,g,a[10002], b[10002], j, d[5002], v[5002];

int main()
{
    fin>>n;
    fin>>g;
    for(i=1;i<=n;i++)
    {
        fin>>d[i]>>v[i];
    }

    for(i=1;i<=n;i++)
    {
        for(j=1;j<=g;j++)
        {

            if(d[i]>j)
            {
                b[j]=a[j];
            }
            else
            {
                b[j]=max(a[j], a[j-d[i]]+ v[i]);
            }

        }
        for(j=1;j<=g;j++)
        {
            a[j]=b[j];
        }
    }
    fout<<a[g];


    return 0;
}