#include <iostream>
int n, maxc, minc;
using namespace std;
int main()
{
    cin >> n;
    short a[101];
    for(int i = 1; i < n; i++)
    {
        cin >> a[i];
        if(a[i] > maxc)
        {
            maxc = a[i];
        }
        if(a[i] < minc)
        {
            minc = a[i];
        }
    }
    cout << maxc - minc;
    return 0;
}