#include<cstdio>
using namespace std;
int n,g,i,solutie[10000],a[5001],b[5001],sol,j;
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",&a[i],&b[i]);
    solutie[0]=0;
    sol=0;
    for(i=1;i<=n;i++)
        for(j=g-a[i];j>=0;j--)
        {
          if(solutie[j+a[i]]<solutie[j]+b[i])
          {
              solutie[j+a[i]]=solutie[j]+b[i];
              if(solutie[j+a[i]]>sol)
                    sol=solutie[j+a[i]];

          }
        }
        printf("%d\n",sol);
    return 0;
}