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#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("economie.in");
ofstream g("economie.out");
int i,j,ii,jj,s,kk,viz[1002],v[1002],sol[1002],k,n;
int main()
{
f>>n;
for(i=1; i<=n; i++)
{
f>>v[i];
}
sort(v+1,v+n+1);
for(i=1; i<=n; i++)
{
if(viz[v[i]]==0)
{
viz[v[i]]=1;
sol[++k]=v[i];
}
for(j=1; j+v[i]<=v[n]; j++)
{
if(viz[j]==1)
{
viz[j+v[i]]=1;
}
}
}
g<<k<<'\n';
for(i=1; i<=k; i++)
g<<sol[i]<<'\n';
return 0;
}