#include<cstdio>
using namespace std;
int n,gm,q,s,i,j,ii,max,g,v[10009],p[5006],w[5006];
int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    scanf("%d%d",&n,&g);
    for(i=1;i<=n;i++)
    {
        scanf("%d%d",&w[i],&p[i]);
    }
    for(i=1;i<=g;i++)
        v[i]=-1000000000;
    for(i=1;i<=n;i++)
    {
        for(j=g-w[i];j>=0;j--)
        {
            if(v[j]+p[i]>v[j+w[i]])
                v[j+w[i]]=v[j]+p[i];
        }
    }
    for(i=0;i<=g;i++)
        if(max<v[i]) max=v[i];
    printf("%d",max);
    return 0;
}