#include<fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n, gmax, w[5001], p[5001], a[5001][10001], i, j;
int main()
{
    f>>n>>gmax;
    for(i=1;i<=n;i++)f>>w[i]>>p[i];
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=gmax;j++)
        {
            a[i][j]=a[i-1][j];
            if(j>=w[i])
            {
                a[i][j]=max(a[i-1][j],p[i]+a[i-1][j-w[i]]);
            }
        }
    }
    g<<a[n][gmax];
    f.close();
    g.close();
    return 0;
}