#include <fstream>
#include <vector>

using namespace std;

ifstream cin("rucsac1.in");
ofstream cout("rucsac1.out");

vector< pair<int, int> > A;
int F[10005], P[10005];
int n, c;

void citire()
{
    int x, y;

    cin >> n >> c;
    for(int i = 1 ; i <= n ; i++)
        cin >> x >> y,
        A.push_back(make_pair(x, y));

}

void rez()
{
    for(int i = 0 ; i < A.size() ; i++)
        for(int j = c ; j >= A[i].first ; j--)
            if(F[j] < F[j - A[i].first] + A[i].second )
                F[j] = F[j - A[i].first] + A[i].second,
                P[j] = i;
}

void print()
{
    cout << F[c] << '\n';
}

int main()
{
    citire();
    rez();
    print();
    return 0;
}