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2 years ago
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#include <iostream>

using namespace std;

int main()
{
    int n;
    while(cin>>n){
        if(n==0) break;
        int ans=1;
        for(int i=1;i*i<=n;i++){
                ans=max(ans,i*i);

        }
        cout<<ans<<endl;
    }
    return 0;
}
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