#include<bits/stdc++.h>
using namespace std;
int a[100001];
int main()
{
	int n;
	cin>>n;
    for(int i=1;i<=n;i++)
    {
    	scanf("%d",&a[i]);
	}
	sort(a+1,a+n+1);
	cout<<a[n]-a[1];
    return 0;
}

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