import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] a = new int[n];
        for(int a_i=0; a_i < n; a_i++){
            a[a_i] = in.nextInt();
        }
        int diff;
        int min = 99999999;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                if (a[j] != a[i]) {
                    if (a[j]<0 || a[i]<0 ) {
                        diff = Math.abs(a[j]) + Math.abs(a[i]);
                    }
                    else {
                        diff = Math.abs(a[j]-a[i]);
                    }
                    if (diff < min) min = diff;
                }
                
            }
        }
        System.out.println(min);
    }
}