#include <iostream>using namespace std;double a[1000];int main(){int n;double avg, big, small;while(cin >> n && n){ big = small = avg = 0; for(int i=0; i<n; i++){ cin >> a[i]; avg += a[i]; } avg /= (double)n; avg =(int)(avg*100+0.5)/100.0; for(int i=0; i<n; i++){ if(a[i] <= avg) big += (avg - a[i]); else small -= (avg - a[i]); } cout.precision(2); cout << '$' << fixed << min(big, small) << endl; }}
