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#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
long long N,G,W[10005],P[10005],a[2][10005];
int main()
{
fin>>N>>G;
for(int i=1;i<=N;i++)
{
fin>>W[i]>>P[i];
}
int l;
for(int i=1;i<=N;i++)
{
if(i%2!=0)l=0;
else l=1;
for(int j=1;j<=G;j++)
{
if(j<W[i]) a[1-l][j]=a[l][j];
else
{
a[1-l][j]=max(a[l][j],a[l][j-W[i]]+P[i]);
}
}
}
fout<<a[1-l][G];
return 0;
}