#include<fstream>
using namespace std;

ifstream f1("rucsac.in");
ofstream f2("rucsac.out");

long long n, pd[10005], p[5005], w[5005], ma;
int main()
{
    f1 >> n >> ma;
    for(int i = 1; i <= n; ++i)
        f1 >> w[i] >> p[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]);
    f2 << pd[ma];
    f1.close();
    f2.close();
    return 0;
}