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#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("economie.in");
ofstream g("economie.out");
int d[51000], n, maxi, i,v[1100],j, rez[1100], k;
int main()
{
f>>n;
for(i=1;i<=n;i++){
f>>v[i];
maxi=max(maxi,v[i]);
}
sort(v+1,v+n+1);
d[0]=1;
for(i=1;i<=n;i++)
if(d[v[i]]==0){
rez[++k]=v[i];
for(j=0; j<=maxi-v[i]; j++)
if(d[j]==1)
d[j+v[i]]=1;
}
g<<k<<"\n";
for(i=1;i<=k;i++) g<<rez[i]<<" ";
return 0;
}