#include <cstdio>
using namespace std;
int d[5001];
int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    int n,i,G,g,p,smax=0,max=0,j;
    scanf("%d%d",&n,&G);
    for(i=1;i<=n;i++)
    {
        scanf("%d%d",&g,&p);
        for(j=smax;j>=0;j--)
        {
            if(d[j]!=-1 && j+g<=G)
                if(d[j+g]<d[j]+p)
                d[j+g]=d[j]+p;
            if(j+g>smax) smax=j+g;
        }
    }
    for(i=G;i>=1;i--)
        if(max<d[i]) max=d[i];
    printf("%d\n",max);
    return 0;
}