#include <cstdio>
using namespace std;
int last[10000],ma[10000];
int main()
{freopen("rucsac.in","r",stdin);
freopen("rucsac.out","w",stdout);
    int n,g,i,m=0,x,j;
scanf("%d%d",&n,&g);
    int v[n],price[n];
    for(i=0;i<n;i++)
        {scanf("%d",v+i);scanf("%d",&(price[i]) );}
         last[0]=-1;

        for(i=0;i<n;i++)
        {
            for(j=g-v[i];j>=0;j--)
            {
                if(last[j]!=0)
                    if(last[j+v[i]]==0||price[i]+ma[j]>ma[j+v[i]])
                {
                    ma[v[i]+j]=price[i]+ma[j];
                    last[v[i]+j]=i+1;
                    if(m<ma[v[i]+j])m=ma[v[i]+j];
                }
            }
        }
printf("%d",m);
    return 0;

}