#include using namespace std; #define REP(i,n) for(int i=0;i<(int)(n);++i) #define REPR(i,n) for (int i=(int)(n)-1;i>=0;--i) #define FOR(i,c) for(__typeof((c).begin())i=(c).begin();i!=(c).end();++i) #define ALL(c) (c).begin(), (c).end() #define valid(y,x,h,w) (0<=y&&y pii; templatebool chmax(T &a, const T &b) { if (abool chmin(T &a, const T &b) { if (bbasic_ostream& operator<<(basic_ostream&os, const C& c){os<<'[';for(auto i=begin(c);i!=end(c);++i)os<<(i==begin(c)?"":" ")<<*i;return os<<']';} templateostream&operator<<(ostream &o,const pair&t){return o<<'('<void output(ostream&,const Tp&){} templatevoid output(ostream &o,const Tp&t){if(N)o<<',';o<(t);output(o,t);} templateostream&operator<<(ostream&o,const tuple&t){o<<'(';output<0,tuple,Ts...>(o,t);return o<<')';} templatevoid output(T t,char z=10){if(t<0)t=-t,putchar(45);int c[20]; int k=0;while(t)c[k++]=t%10,t/=10;for(k||(c[k++]=0);k;)putchar(c[--k]^48);putchar(z);} templatevoid outputs(T t){output(t);} templatevoid outputs(S a,T...t){output(a,32);outputs(t...);} templatevoid output(T *a,int n){REP(i,n)cout<void output(T *a,int n,int m){REP(i,n)output(a[i],m);} templatebool input(T &t){int n=1,c;for(t=0;!isdigit(c=getchar())&&~c&&c-45;); if(!~c)return 0;for(c-45&&(n=0,t=c^48);isdigit(c=getchar());)t=10*t+c-48;t=n?-t:t;return 1;} templatebool input(S&a,T&...t){input(a);return input(t...);} templatebool inputs(T *a, int n) { REP(i,n) if(!input(a[i])) return 0; return 1;} ll C[10]; int main() { int B,N; while(input(B,N)){ inputs(C,N); ll low=0, high=1LL<<40; while(low+1= 0) high = mid; else low = mid; } sort(C,C+N); ll target = min(high,C[(N-1)/2]) ; ll ans = 0; REP(i,N) ans += abs(target-C[i]); cout << ans << endl; } }