#include <fstream>
#include <algorithm>
#include <iomanip>
#define f first
#define s second
using namespace std;
pair <int,int> v[1005];
int a[5][1005];
ifstream cin("ruucsac.in");
ofstream cout("rucsac.out");
int main()
{
    int n,gm;
    cin>>n>>gm;
    for(int i=1; i<=n; ++i)
    {
        cin>>v[i].f>>v[i].s;
    }
   // for(int i=1; i<=gm; ++i)
        //if(i<=v[1].f)
            //a[1][i]=v[1].s;
            int x1=0,x2=1;
    for(int i=1; i<=n; ++i)
    {
        for(int j=0; j<=gm; ++j)
        {
            a[x2][j]=a[x1][j];
            if(j>=v[i].f)
                a[x2][j]=max(a[x2][j],a[x1][j-v[i].f]+v[i].s);
        }
        swap(x1,x2);
    }
    cout<<a[x1][gm];
    return 0;
}