include [HTML_REMOVED]
include [HTML_REMOVED]
using namespace std;
const int N = 100010;
int n;
int a[N];
int main(){
cin >> n;
for (int i = 0; i < n; i) cin >> a[i];
sort(a, a + n);
int res = 0;
for (int i = 0; i < n; i ) res += abs(a[i] - a[n / 2]);
cout << res << endl;
return 0;
}