#include <cstdio>

using namespace std;
int g[5005],p[5005],G,n;
int d[10005],sum=0;
int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    scanf("%d %d",&n,&G);
    for(int i=1;i<=n;i++)
        scanf("%d %d",&g[i],&p[i]);
    for(int i=1;i<=n;i++)
    {
        for(int j=G-g[i];j>=0;j--)
            if(d[j+g[i]]<p[i]+d[j])
            {
                d[j+g[i]]=d[j]+p[i];
                if(d[j+g[i]]>sum)
                    sum=d[j+g[i]];
            }
    }
    printf("%d\n",sum);
    return 0;
}