#include <fstream>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int v[10005];
int main()
{
    int n,w,i,j,a,b;
    in>>n>>w;
    v[0]=1;
    for (i=1; i<=n; i++)
    {
        in>>a>>b;
        for (j=w; j>=a; j--)
        {
            if (v[j-a]+b>v[j] && v[j-a]!=0)
                v[j]=v[j-a]+b;
        }
    }
    int max1=0;
    for (i=1; i<=w; i++)
    {
        max1=max(max1,v[i]);
    }
    out<<max1-1;
}