#include <fstream>

using namespace std;

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int d[5002],p[5002],w[5002];

int main()
{
    int n,s,maxim;
    fin>>n>>s;
    for(int i=1;i<=n;i++)
    {
        fin>>w[i]>>p[i];
    }
    d[0]=1;
    for(int i=1;i<=n;i++)
    {
        for(int j=s;j>=0;j--)
        {
            if(d[j]>=1&&(j+w[i])<=s)
            {
                d[j+w[i]]=p[i]+d[j];
            }
        }
    }
    maxim=0;
    for(int i=0;i<=s;i++)
    {
        if(d[i]>maxim)
            maxim=d[i];
    }
    fout<<maxim-1<<"\n";
    return 0;
}