#include<fstream>
#include<iostream>
#include <algorithm>
using namespace std;
ifstream f ("rucsac.in");
ofstream g("rucsac.out");
int n,gmax,rasp;
int matr[5001][10001];
int main()
{
    f >> n >> gmax;
    for(int i = 1;i<=n;i++)
    {
        int gr,cost;
        f >> gr>> cost;
        for(int j = 1;j<=gmax;j++)
        {
            if(j-gr>1)
            matr[i][j] = max(matr[i-1][j],matr[i-1][j-gr]+cost);
            else
                matr[i][j] = matr[i-1][j];
        }
    }
    g << matr[n][gmax];

}