#include <fstream>
#define nmax 5001
#define gmax 10001
using namespace std;
ifstream fin ("rucsac.in");
ofstream fout ("rucsac.out");
int n , G;
struct obiect {int g ; int C;};
obiect a[nmax];
int c[nmax][gmax];
void Citire ()
{
    int i;
    fin>>n>>G;
    for(i=1;i<=n;i++)
        fin>>a[i].g>>a[i].C;
}
void Dinamica ()
{
    int i , j;
    for(i=0;i<=G;i++) c[0][i]=0;
    for(j=0;j<=n;j++) c[j][0]=0;
    for(i=1;i<=n;i++)
         for(j=1;j<=G;j++)
           if ( a[i].g>j) c[i][j]=c[i-1][j];
           else c[i][j]=max(c[i-1][j],a[i].C+c[i-1][j-a[i].g]);
        fout<<c[n][G]<<"\n";
}

int main()

{
    Citire();
    Dinamica();


    return 0;
}