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#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
struct perechi{int gr;int pr;}v[5005];
int r[10005],n,g;
int main()
{
int i,j;
fin>>n>>g;
for(i=1; i<=n; i++)
fin>>v[i].gr>>v[i].pr;
for(i=1; i<=g; i++)
{
if(v[1].gr<=i)
r[i]=v[1].pr;
}
for(i=2; i<=n; i++)
{
for(j=g; j>=1; j--)
{
if(j-v[i].gr>=0)
{
if(r[j-v[i].gr]+v[i].pr>r[j])
r[j]=r[j-v[i].gr]+v[i].pr;
}
}
}
fout<<r[g];
fin.close();
fout.close();
return 0;
}