#include<cstdio>
using namespace std;
int d[1000005];
int main()
{
    int n,greutate,last,i,j,g,p,max1=0;
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    scanf("%d%d",&n,&greutate);
    for(i=1;i<=greutate;i++)
    {
        d[i]=-1;
    }
    d[0]=0;
    last=0;
    for(i=1;i<=n;i++)
    {
        scanf("%d%d",&g,&p);
        for(j=last;j>=0;j--)
            if(d[j]!=-1 && j+g<=greutate)
               if(d[j+g]<d[j]+p)
        {
            d[j+g]=d[j]+p;
            if(j+g>last)
                last=j+g;
        }
    }
    for(i=1;i<=greutate;i++)
    {
        if(max1<d[i])
            max1=d[i];
    }
    printf("%d",max1);
    return 0;
}