#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
# your code goes here
diffList = []
for i in range(0, len(a)):
    if i != len(a)-1:
        diff = a[i] - a[i+1]
        diffList.append(abs(diff))
    elif i == len(a)-1:
        diff = a[i] - a[0]
        diffList.append(abs(diff))
print(min(diffList))