~cpp
#include <iostream>
#include <cmath>
using namespace std;
#define MAX_STU 1000
double student[MAX_STU+1];
int student_num, i, j, sum, average;
double least, most;
double calculate()
{
sum = 0;
least = most = 0.0;
for(j=1; j<student_num+1; j++)
{
student[j] = student[j]*100;
sum = sum + student[j];
}
average = sum/student_num;
for(j=1; j<student_num+1; j++)
{
if(student[j]<average)
least = least + average - student[j];
if(student[j]>average+1)
most = most + student[j] - average - 1;
}
if(most <least )
return least;
return most;
}
int main()
{
cout.setf(ios::fixed, ios::floatfield);
cout.setf(ios::showpoint);
cout.precision(2);
while(cin>>student_num)
{
if(student_num==0)
break;
for(i=1; i<student_num+1; i++)
cin >> student[i];
cout << "$" << calculate()/100 <<endl;
}
return 0;
}