#include <fstream>
using namespace std;
ifstream fi ("rucsac.in");
ofstream fo ("rucsac.out");
int n,g,x,gr[5005],co[5005],a[5005][10010];
int main()
{
    fi>>n>>g;
    for(int i=1;i<=n;i++)
        fi>>gr[i]>>co[i];
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=g;j++)
        {
            if(j-gr[i]<0)
                x=a[i-1][j];
            else x=max((a[i-1][j-gr[i]]+co[i]),a[i-1][j]);
            a[i][j]=x;
        }
    }
    fo<<a[n][g];
    fi.close();
    fo.close();
    return 0;
}