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#include <fstream>
using namespace std;
ifstream fin("energii.in");
ofstream fout("energii.out");
int G,W,eg[10001],cg[10001],a[10001][10001];
bool sync_with_stdio(bool sync=0);
int main()
{
fin>>G;
fin>>W;
int i;
for(i=1;i<=G;i++)
fin>>eg[i]>>cg[i];
int j;
for(i=1;i<=W;i++)
for(j=1;j<=W;j++)
if(a[i-1][j-eg[i]]+cg[i]>a[i-1][j])
a[i][j]=a[i-1][j-eg[i]]+cg[i];
else
a[i][j]=a[i-1][j];
fout<<a[W][W];
return 0;
}