#include <iostream>
#include <fstream>
#include <algorithm>
#include <vector>
class Task()
{
private:
vector<int> array;
public:
Task()
{
ifstream in("input.txt");
int data;
while(in>>data)
{
array.push_back(data);
}
}
~Task()
{
int sum = 0;
sort(array.begain(),array.end());
for(int i=0;i<array.size();i++)
{
sum += array[i]*(array.size()-i);
}
ofStream out("out.txt");
out<<sum/array.size()<<endl;
out.flush(();
out.close(();
}
}
int main()
{
Task task();
return 0;
}