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#include <fstream>
using namespace std;
ifstream fin ("rucsac.in");
ofstream fout ("rucsac.out");
int n, g, p[5002], w[5002], l1[10001], l2[10001];
int main()
{
fin>>n>>g;
for(int i=1; i<=n; i++)
{
fin>>w[i]>>p[i];
}
for(int i=1; i<=n; i++)
{
for(int j=1; j<=g; j++)
{
if(w[i]>j)
{
l2[j]=l1[j];
}
else
{
int val=l1[j-w[i]]+p[i];
l2[j]=max(l1[j], val);
}
}
for(int t=1; t<=g; t++)
{
l1[t]=l2[t];
}
}
fout<<l2[g];
return 0;
}