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#include <iostream>
#include <algorithm>
using namespace std;
const int GMAX=10000;
int d[GMAX+5];
int main()
{
int n,i,j,g,p,last,G,pmax=0;
cin>>n>>G;
d[0]=0;
last=0;
for(i=1;i<=G;i++)
d[i]=-1;
for(i=1;i<=n;i++)
{
cin>>g>>p;
for(j=last;j>=0;j--)
{
if(j+g>G)
continue;
if(d[j]!=-1)
if(d[j]+p>d[j+g])
d[j+g]=d[j]+p;
last=max(last,j+g);
}
}
for(j=G;j>=0;j--)
if(d[j]>pmax)
pmax=d[j];
cout<<pmax;
return 0;
}