#include<bits/stdc++.h>
using namespace std;
int n,a[200005];
double x=0.0;//平均数  
double y,ans=0;
int main()
{
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>a[i];
		x=x+(double)a[i];
	}
	x=x/(double)n;
	for(int i=1;i<=n;i++)
	{
		y=a[i]-x;
		if(y<0)
			ans-=y;
		else
			break;
	}
	cout<<ans;
	return 0;
}