#include <fstream>

using namespace std;
int d[10005];
int main()
{
    ifstream cin("rucsac.in");
    ofstream cout("rucsac.out");
    int n, g, w, p, l = 0,i,j;
    cin>>n>>g;
    d[0]=0;
    for(i = 1; i <= g; i++)
    {
        d[i] = -1;
    }
    for( i = 1; i <= n; i++)
    {
        cin>>w>>p;
        for( j = l; j >= 0; j--)
        {
            if(w+j>g)
                continue;
            if(d[j] != -1)
            {
                if(d[j + w] < d[j] + p)
                    d[j + w] = d[j] + p;
            }
            if(j + w > l)
                l =w+j;
        }
    }
    l = -1;
    for(i = 1; i <= g; i++)
    {
        if(d[i] > l)
        {
            l = d[i];
        }
    }
    cout<<l;
    return 0;
}