#include <iostream>
#include <cmath>
using namespace std;

int main()
{   
    int n;
    cin >> n;
    int a[n];
    for(int i = 0; i < n; i++) cin >> a[i];

    int std_diffrence = 0;
    for(int i = 0; i < n - 1; i++)
    {
        for(int j = 1; j < n; j++)
        {
            int real_diffrence = a[i] - a[j];
            if(fabs(real_diffrence) > fabs(std_diffrence)) std_diffrence = real_diffrence;
            else continue;
        }
    }

    cout << fabs(std_diffrence);
    return 0;
}