#include <cstdio>

using namespace std;
int n,g,w[5001],p[5001],d[10001];
int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    scanf("%d %d\n",&n,&g);
    for(int i=1;i<=n;i++)
        scanf("%d %d\n",&w[i],&p[i]);
    int sol=0;
    for(int i=1;i<=n;i++)
    {
        for(int j=g-w[i];j>=0;j--)
        {
            if(d[j+w[i]]<d[j]+p[i])
            {
                d[j+w[i]]=d[j]+p[i];
                if(d[j+w[i]]>sol)
                    sol=d[j+w[i]];
            }
        }
    }
    printf("%d\n",sol);
    return 0;
}