#include<fstream>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
inline int max(int a, int b){if(a>b)return a; else return b;}
int a[10001],n,g,w,p;
int main()
{
    in>>n>>g;
    a[0]=1;
    int vmax=0;
    while(n--)
    {
        in>>w>>p;
        for(int i=g-w;i>=0;--i)
        {
            if(a[i])
                a[i+w]=max(a[i+w],a[i]+p);
            if(a[i+w]>vmax) vmax=a[i+w];
        }
    }
    out<<vmax-1<<'\n';
    out.close();
    return 0;
}