#include<fstream>
using namespace std;

ifstream f("rucsac.in");
ofstream g("rucsac.out");

long long n, pd[10005], p[5005], w[5005], ma;
int main()
{
    f >> n >> ma;
    for(int i = 1; i <= n; ++i)
        f >> p[i] >> w[i];
    for(int i = 1; i <= n; ++i)
         for(int j = ma - w[i]; j >= 0; --j)
            pd[j + w[i]] = max(pd[j + w[i]], pd[j] + p[i]);
    g << pd[ma];
    f.close();
    g.close();
    return 0;
}