#include <iostream>
#DEFINE mx (a>b)?a:b
using namespace std;
int g[5000], val[5000], optim[10001];
int main()
{
    ifstream f("rucsac.in");
    ofstream g("ofstream.out");
    int n, G;
    f >> n >> G;
    for (i=0;i<n;i++)
        f >> g[i] >> val[i];
    for (i=0;i<n;i++)
        for (j=G-g[i];j>=0;j--)
            if (optim[j+g[i]] < optim[j]+val[i])
                optim[j+g[i]] = optim[j]+val[i];
    g << optim[G];
    f.close(), g.close();
    return 0;
}