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#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("economie.in");
ofstream fout("economie.out");
int n,x,maxim,k,minim,i1,i,g1,g,s;
int d[50004],v[1004],v1[1004];
int main()
{
fin>>n;
for(int i=1;i<=n;i++)
{
fin>>v[i];
maxim=max(v[i],maxim);
}
sort(v+1,v+n+1);
d[0]=1;
for(int i=1;i<=n;i++)
{
if(d[v[i]]==0)
{
v1[++k]=v[i];
for(int j=0;j<=maxim;j++)
if(v[i]+j<=maxim && d[j]==1)
{
d[j+v[i]]=1;
}
}
}
fout<<k<<"\n";
for(int i=1;i<=k;i++)
fout<<v1[i]<<"\n";
return 0;
}