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#include<fstream>
using namespace std;
int N,G,w[10001],p[10001],i,j,a[10001],Max;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int main ()
{
fin>>N>>G;
for(i=1;i<=N;i++)
{
fin>>w[i]>>p[i];
}
a[0]=1;
for(i=1;i<=N;i++)
{
for(j=G;j>=0;j--)
{
if(a[j]>0 && w[i]+j<=G)
{
if(p[i]+a[j]>a[j+w[i]])
{
a[w[i]+j]=p[i]+a[j];
}
}
}
}
Max=0;
for(i=1;i<=G;i++)
{
if(a[i]>Max)
{
Max=a[i];
}
}
fout<<Max-1;
fin.close();
fout.close();
return 0;
}