#include <fstream>
using namespace std;
int g, w, i, n, p, Max, j;
int v[10001];

int main () {
    ifstream fin ("rucsac.in");
    ofstream fout ("rucsac.out");
    fin>>n>>g;

    for (i=1;i<=g;i++) {
        v[i]=-1;
    }

    for (i=1;i<=n;i++) {
        fin>>w>>p;
        for (j=g-w;j>=0;j--) {
            if (v[j]!=-1) {
                if (v[j+w]<v[j]+p)
                    v[j+w]=v[j]+p;
            }
        }
    }

    for (i=1;i<=g;i++)
        Max=max(Max,v[i]);

    fout<<Max;
    return 0;
}