#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,g,mat[5002][10005];
pair<int,int>p[5002];
int main()
{
    fin>>n>>g;
    for(int i=1;i<=n;i++)
        fin>>p[i].first>>p[i].second;
    for(int i=1;i<=n;i++)
        for(int j=1;j<=g;j++)
        {
            if(j>=p[i].first)
                mat[i][j]=max(max(mat[i][j-1],mat[i-1][j]),mat[i-1][j-p[i].first]+p[i].second);
            else mat[i][j]=max(mat[i][j-1],mat[i-1][j]);
        }
    fout<<mat[n][g]<<"\n";
    return 0;
}