long s,q;i,j,a[10];main(){for(scanf("%d%*d",&q);~scanf("%d",a+i);j=++i)for(q+=a[i];j--;)a[j+1]<a[j]?a[j+1]^=a[j]^=a[j+1]^=a[j]:0;i=a[j/2]+a[~-j/2]>>1;q/=j;for(q<i?i=q:0;j--;s+=abs(a[j]-i));printf("%ld",s);}