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#include <fstream>
using namespace std;
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
int d[10005];
int main()
{
int N,GMAX,i,j,last,p,g,Pmax;
cin>>N>>GMAX;
d[0]=0;
for(i=1;i<=GMAX;i++)
d[i]=-1;
last=0;
for(i=1;i<=N;i++)
{
cin>>G>>P;
for(j=last;j>=0;j--)
{
if(j+G>GMAX)
continue;
if(d[j]!=1)
{
if(d[j+G]<d[j]+P)
{
d[j+G]=d[j]+P;
if(j+G>last)
last=j+G;
}
}
}
}
Pmax=d[1];
for(i=1;i<=GMAX;i++)
if(d[i]>Pmax)
Pmax=d[i];
cout<<Pmax;
return 0;
}