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#include <fstream>
using namespace std;
ifstream fin ("rucsac.in");
ofstream fout ("rucsac.out");
int n,g,a,b,Max,v[100001],i,j;
int main()
{
fin>>n>>g;
for(i=1;i<=n;i++)
{
fin>>a>>b;
for(j=g-a;j>=0;j--)
{
if(v[j]!=0||j==0)
v[j+a]=max(v[j]+b,v[j+a]);
}
}
Max=-1;
for(i=1;i<=g;i++)
{
Max=max(Max,v[i]);
}
fout<<Max;
return 0;
}