include[HTML_REMOVED]

include[HTML_REMOVED]

using namespace std;
const int N=1e5+10;
int n;
int a[N];

int main()
{
cin>>n;
for(int i=0;i[HTML_REMOVED]>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;

}