#include <fstream>

using namespace std;

ifstream cin ("rucsac.in");
ofstream cout ("rucsac.out");

int v[5002],v2[5002],a[2][10002];
int main()
{
    int n,g;
    cin>>n>>g;
    for(int i=1; i<=n; i++)
        cin>>v[i]>>v2[i];
    for(int i=1; i<=n; i++)
    {
        for(int j=1; j<=g; j++)
        {
            if(v[i]<=j && v2[i]+a[(i-1)%2][j-v[i]]>a[(i-1)%2][j])
                a[i%2][j]=v2[i]+a[(i-1)%2][j-v[i]];
            else
                a[i%2][j]=a[(i-1)%2][j];
        }
    }
    cout<<a[n%2][g];

    return 0;
}