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#include <iostream>
#include <algorithm>
#include <fstream>
#include <cmath>
using namespace std;
ifstream f("economie.in");
ofstream g("economie.out");
int n,v[1005],dr[1005],nr=0,tr=0,maxim;
bool ghiozdan[50005];
int main()
{
f>>n;
for(int i=1;i<=n;i++)
f>>v[i];
sort(v+1,v+n+1);
maxim=v[n];
bool OK=0;
while(OK==0)
{
OK=1; tr++;
if(ghiozdan[v[tr]]==0)
{
nr++;
dr[nr]=v[tr];
ghiozdan[v[tr]]=1;
for(int i=1;i<=maxim-v[tr];i++)
if(ghiozdan[i+v[tr]]==1)
ghiozdan[i]=ghiozdan[i+v[tr]];
OK=0;
}
else OK=0;
if(tr==n) OK=1;
}
g<<nr;
for(int i=1;i<=nr;i++)
g<<endl<<dr[i];
}