#include <fstream>

using namespace std;

int d[10001];

int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    int n,G,g,p,smax,profit,i,j;
    scanf("%d%d",&n,&G);
    for(i=1;i<=G;i++)
    d[i]=-1;
    smax=0;
    for(i=1;i<=n;i++)
    {
        scanf("%d%d",&g,&p);
        for(j=smax;j>=0;j--)
        if(d[j]!=-1 and j+g<=G)
        {
            if(d[j+g]<d[j]+p)
            d[j+g]=d[j]+p;
            if(j+g>smax)
            smax=j+g;
        }
    }
    profit=0;
    for(i=G;i>=1;i--)
        if(d[i]>profit)
            profit=d[i];
    printf("%d",profit);
    return 0;
}