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#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int d[1000005],i,n,j,last,g,p,GMAX,maxi=-1;
int main()
{
fin>>n>>GMAX;
for(i=1;i<=GMAX;i++)
d[i]=-1;
d[0]=0;
last=0;
for(i=1;i<=n;i++)
{
fin>>g>>p;
for(j=last;j>=0;j--)
if(d[j]!=-1 && j+g<=GMAX)
if(d[j+g]<d[j]+p)
{
d[j+g]=d[j]+p;
if(j+g>last)
last=j+g;
}
}
for(i=1;i<=GMAX;i++)
{
if(d[i]>maxi)
maxi=d[i];
}
fout<<maxi;
return 0;
}