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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- long long a,b,c,d=-100000000,e,f,i,j,k,l;
- cin>>b;
- while(b--)
- {
- cin>>a;
- c=sqrt(a);
- if(c*c!=a || a<0)
- {
- d=max(d,a);
- }
- }
- cout<<d<<endl;
- return 0;
- }
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