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#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int a[10100];
int nr,gmax;
int n,g;
void citire_rez()
{
fin>>nr>>gmax;
for(int j=0;j<nr;j++)
{
fin>>n>>g;
for(int i=gmax-n;i>=0;i-- )
{
if(a[i]!=0 || i==0)
{
if(a[i+n]<a[i]+g)
{
a[i+n]=a[i]+g;
}
}
}
}
int maxi=-1;
for(int i=0;i<=gmax;i++) if(a[i]>maxi)maxi=a[i];
fout<<maxi;
}
int main()
{
citire_rez();
fin.close();
fout.close();
return 0;
}