#include <fstream.h>
long a[50004],n,S=0,max;
void citire(){
ifstream fin("economie.in");
fin>>n;
long x;
for (long i=0;i<n;i++) {
      fin>>x;
      a[x]=1;
      }
fin.close();
}

void numarare(){
for (long i=0;i<max;i++)
   if (a[i]==1){
      S++;
      for (long m=0;m<max;m++)
	if (a[m]>0)
      for (long j=1;j<max;j++)
	 if (i*j+m>max)
	    break;
	 else
	    a[i*j+m]=2;
   }
}
int main(){
for (long ii=50001;ii>0;ii--)
   if (a[ii]==1){
     max=ii;
     break;}
ofstream fout("economie.out");
citire();
numarare();
fout<<S<<"\n";
for (long i=0;i<max;i++)
   if (a[i]==1)
       fout<<i<<"\n";
fout<<"\n";
fout.close();
return 0;
}