N = int(input())
integers = list(map(int,input().split()))

def is_palindromic(integer):
    string = str(integer)
    reverse_string = string[-1::-1]
    if string == reverse_string :
        return True
        
print((all(map(lambda x: x>0, integers))) and (any(map(lambda x: is_palindromic(x), integers))))