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#include<fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
unsigned n,gr,v[5001],g[5001],a[10001],b[10001],i,j;
int main()
{
fin>>n>>gr;
for(i=1;i<=n;i++)
{
fin>>g[i]>>v[i];
}
for(i=1;i<=n;i++)
{
for(j=g[i];j<=gr;j++)
{
b[j]=a[j];
b[j]=max(a[j],a[j-g[i]]+v[i]);
}
for(j=1;j<=gr;j++)
{
a[j]=b[j];
}
}
fout<<a[gr];
return 0;
}