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#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,d[10001],G,g,p,maxim;
int main()
{
fin>>n>>G;
memset(d,-1,sizeof(d));
d[0]=0;
for(int i=1;i<=n;i++)
{ fin>>g>>p;
for(int j=G-g;j>=0;j--)
{
if(d[j]!=-1)
{
d[j+g]=max(d[j+g],d[j]+p);
}
}
}
for(int i=1;i<=G;i++)
{
if(d[i]>maxim)
maxim=d[i];
}
fout<<maxim;
return 0;
}