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

int main() {
	int n;
	cin>>n;
	vector<int>v(n);
	for (int i=0; i<n; i++){
	    cin>>v[i];
	}
	sort(v.begin(), v.end());
	vector<int>diff(n);
	int sum = 0;
	for (int i=0; i<n-1; i++){
	    diff[i] = v[i+1] - v[i];
	    sum += diff[i];
	}
	cout<<sum;
	
	return 0;
}