n=Scanf_Int();
        int[] a=new int[n+1];
        for (int i=1;i<=n;i++){
            a[i]=Scanf_Int();
        }
        a[0]=a[n];
        for (int i=1;i<=n;i++){
            min=Math.min(min,Math.abs(a[i]-a[i-1]));
        }
        out.println(min);