#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;

//template
#define rep(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define ALL(v) (v).begin(),(v).end()
typedef long long int ll;
const int inf = 0x3fffffff; const ll INF = 0x1fffffffffffffff; const double eps=1e-12;
template<typename T>inline bool chmax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
template<typename T>inline bool chmin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
//end



int main(){
   int n; cin>>n;
   vector<int> a(n);
   rep(i,0,n)cin>>a[i];
   sort(ALL(a));
   int mid=a[n/2]; ll res=0;
   rep(i,0,n)res+=abs(mid-a[i]);
   cout<<res<<endl;
   return 0;
}