#include <fstream>
#define dim 5010
using namespace std;
int d[dim][10010];
int i,j,n,m;

struct acab{
    int x,y;
}a[dim];

int main() {
    ifstream fin("rucsac.in");
    ofstream fout("rucsac.out");
    fin>>n>>m;
    for (i=1;i<=n;i++) {
        fin>>a[i].x>>a[i].y;
    }
    for (i=1;i<=n;i++) {
        for (j=1;j<=m;j++) {
            d[i][j]=max(d[i-1][j],d[i][j-1]);
            if (j>=a[i].x) {
                d[i][j]=max(d[i][j],a[i].y+d[i-1][j-a[i].x]);
            }
        }
    }
    fout<<d[n][m];
  /**  for (i=1;i<=n;i++) {
        for (j=1;j<=m;j++) {
            fout<<d[i][j]<<" ";
        }
        fout<<"\n";
    }  **/
    return 0;
}