include[HTML_REMOVED]
using namespace std;
//取坐标序号靠中间的位置就OK
const int N = 100010;
int a[N];
int main()
{
int n,res = 0;
cin >> n;
for(int i = 0;i < n;i )
{
cin >> a[i];
}
sort(a,a + n);
n –;
for(int i = 0;i < n;i ,n –)
{
res += (a[n] - a[i]);
}
cout << res;
return 0;
}