#include<iostream>
using namespace std;
double function(int* point_int)
{
	int sum=0;
	for(int i=0;i!=5;i++)
	{
		sum=sum+*(point_int+i);
	}
	return sum/5.0;
}
int main()
{
	int* point_int=new int[5];
	for(int i=0;i!=5;i++)
	{
		cout<<"put the "<<i+1<<" marks"<<endl;
		cin>>*(point_int+i);
	}
	cout<<function(point_int);
	return 0;
}