#include <fstream>
#include <iostream>

using namespace std;

int a[1001][1001], n, g;
int p[5003], w[5003];

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int main()
{
    int i, j;
    fin >> n >> g;
    for (i = 1; i <= n; i++)
        fin >> w[i] >> p[i];
    for (i = 1; i <= n; i++)
        for (j = 0; j <= g; j++)
        {
            a[i][j] = a[i-1][j];
            if (w[i] <= j)
                a[i][j] = max(a[i][j], a[i-1][j-w[i]] + p[i]);
        }
    /*for (i = 1; i <= n; i++){
        for (j = 1; j <= g; j++)
            cout << a[i][j] << " ";
        cout << "\n";}*/
    fout << a[n][g] << "\n";
    return 0;
}