#include <fstream>

using namespace std;

int v[5010];
int w[5010];
int d[5010][10010];

int main()
{
    ifstream f("rucsac.in");
    ofstream g("rucsac.out");
    int n, wt;
    f>>n>>wt;

    for(int i = 1; i<=n; i++)
    {
        f>>w[i];
        f>>v[i];
    }


    for(int i = 1; i<=n; i++)
    {
        for(int j = 0; j<=wt; j++)
        {
            if(w[i] <= j)
            {
                d[i][j] = max(v[i] + d[i-1][j-w[i]], d[i-1][j]);
            }
            else
            {
                d[i][j] = d[i-1][j];
            }
        }
    }

    g<<d[n][wt];
    return 0;
}