#include <fstream>
#include <cstring>
#define dim 10010
using namespace std;
int d[2][dim];
int i,j,n,m,c,x,y;

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