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#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int d[10005],n;
int w,g,p,i,G,j,maxim;
int main()
{
fin>>n>>G;
for(i=1; i<=n; i++)
{
d[i]=-1;
}
for(i=1; i<=n; i++)
{
fin>>g>>p;
for(int j=G-g; j>=0; j--)
{
if(d[j]!=-1)
if(d[j]+p>d[j+g])
{
d[j+g]=d[j]+p;
}
}
}
for(j=1;j<=n;j++)
maxim=max(maxim,d[j]);
fout<<maxim;
return 0;
}