#include <iostream>
#include <cmath>
	using namespace std;
	int main()
	{
		int n;
		cin >>n;
		double arr[n],sum=0,sr,c=0,arr1[n],min;
		for (int i=0;i<n;i++)
		{
			cin >>arr[i];
		}
		for (int i=0;i<n;i++)
		{
			cout <<"arr["<<i<<"]="<<arr[i]<<endl;
		}
		for (int  i=0;i<n;i++)
		{
			min=arr[0];
			for (int j=1;j<n;j++)
			{
				if (min>arr[j])
				{
					min=arr[j];
				}
			}
		}cout <<"min="<<min;
		for (int i=3;i<n;i+=3)
		{
			sum+=arr[i];
			c++;
		}sr=sum/c;
		cout <<"sr="<<sr<<endl;

		for (int i=0;i<n;i++)
		{
			arr1[i]=arr[i]-min;
			cout << "arr1["<<i<<"]="<<arr1[i]<<endl;
		}
	}