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#include <fstream>
using namespace std;
ifstream fin ("rucsac.in");
ofstream fout ("rucsac.out");
int gr[5010], val[5010], n, gmax, i, j, a[3][10010], li, k;
int main()
{
fin>>n>>gmax;
for (i=1; i<=n; i++)
fin>>gr[i]>>val[i];
li=1;
for (i=1; i<=n; i++)
{
if (i>1)
li=2;
for (j=0; j<=gmax; j++)
{
if (gr[i]>j)
a[li][j]=a[li-1][j];
else
{
if (a[li-1][j-gr[i]]+val[i]>a[li-1][j])
a[li][j]=a[li-1][j-gr[i]]+val[i];
else
a[li][j]=a[li-1][j];
}
}
for (k=0; k<=gmax; k++)
a[li-1][k]=a[li][k];
}
fout<<a[2][gmax];
fin.close();
fout.close();
return 0;
}