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#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("economie.in");
ofstream fout("economie.out");
int n,i,j,nr,s[50001],v[1001],sol[1001];
int main()
{
fin>>n;
for(i=1;i<=n;i++)
fin>>v[i];
sort(v+1,v+n+1);
s[0]=1;
nr=0;
for(i=1;i<=n;i++){
if(s[v[i]]!=1)
sol[++nr]=v[i];
for(j=0;j<=v[n]-v[i];j++)
if(s[j]==1)
s[j+v[i]]=1;
}
fout<<nr<<'\n';
for(i=1;i<=nr;i++)
fout<<sol[i]<<'\n';
return 0;
}