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#include <fstream>
using namespace std;
const int gmax=10000;
int d[gmax+5];
const int inf=-1e9;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int main()
{
int n,G,w,p,i,last,j,pmax;
fin>>n>>G;
d[0]=0;
for(i=1;i<=G;i++)
d[i]=inf;
last=0;
for(i=1;i<=n;i++)
{
fin>>w>>p;
for(j=last;j>=0;j--)
{
if(j+w>G)
continue;
if(d[j]!=inf)
if(d[j+w]<d[j]+p)
{
d[j+w]=d[j]+p;
if(j+w>last)
last=j+w;
}
}
}
pmax=0;
for(j=1;j<=G;j++)
if(d[j]>pmax)
pmax=d[j];
fout<<pmax;
return 0;
}