#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n,G,w[10002],p[10002],a[5002][10002];
int main()
{
    int i,j;
    f>>n>>G;
    for(i=1;i<=n;i++) f>>w[i]>>p[i];
    for(i=1;i<=n;i++)
        for(j=1;j<=G;j++)
            if(w[i]<=j)
                a[i][j]=max(a[i-1][j],(a[i-1][j-w[i]]+p[i]));
    g<<a[n][G]<<'\n';
    f.close();
    g.close();
    return 0;
}