#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int d[10001];
int main()
{
    int n,G,g,p,smax,i,j,profit;
    fin>>n>>G;
    for(i=1;i<=n;i++)
        d[i]=-1;
    smax=0;
    for(i=1;i<=n;i++)
    {
        fin>>g>>p;
        for(j=smax;j>=0;j--)
            if(d[j]!=-1&&(j+g)<=G)
                {
                    if(d[j+g]<d[j]+p)
                        d[j+g]=d[j]+p;
                    if(j+g>smax)
                        smax=j+g;
                }
    }

    profit=0;
    for(i=G;i>=1;i--)
        if(d[i]>profit)
            profit=d[i];
    fout<<profit;
    return 0;
}