#include <fstream>
using namespace std;
ifstream cin ("rucsac.in");
ofstream cout ("rucsac.out");
int v[10001];
int main()
{
    int n,g,i,j,val,go;
    cin>>n>>g;
    for (i=1;i<=n;i++)
    {
        cin>>go>>val;
        for (j=g;j>=go+1;j--)
        {
            if (v[j-go]!=0)
            {
                if (v[j]==0)
                {
                    v[j]=v[j-go]+val;
                }
                else
                {
                    if (v[j-go]+val>v[j])
                        v[j]=v[j-go]+val;
                }
            }
        }
        if (v[go]<=val)
            v[go]=val;
    }
    int maxx=0;
    for (i=g;i>=1;i--)
    {
        if (v[i]>=maxx)
        {
            maxx=v[i];
        }
    }
    cout<<maxx;
    return 0;
}