main.py

def fatorial(n):
    fat = 1
    
    for i in range(n):
        fat *= (n - i)
    
    return fat

def decremento(n):
    newNumber = ""

    for i in range(n):
        newNumber += str(n - i)
    
    return newNumber

def permutacao(n):

    import random
    perm = []

    while len(perm) != fatorial(len(n)):
        permutacao = "".join(random.sample(n, len(n)))
        
        if not permutacao in perm:
            perm.append(permutacao)
    
    return perm

n = permutacao(decremento(int(input())))
numbers = []

for i in range(len(n) - 1):
    numbers.append(input())

for number in n:
    if not number in numbers:
        print(number)