# coding:utf-8

cups = {1:'false',2:'false',3:'false'}
start_cup = int(input())
cups[start_cup] = 'true'

shuffle_count = int(input())
move = []

for i in range(shuffle_count):
    move.append(list(map(int,input().split())))

for j in range(shuffle_count):
    if move[j][0] == 'true':
        cups[move[j][0]] == 'false'
        cups[move[j][1]] == 'true'
    elif move[j][1] == 'true':
        cups[move[j][0]] == 'true'
        cups[move[j][1]] == 'false'
    else:
        continue

for l in range(1,3):
    if cups[l] == 'true':
        print(l)
        break
    else:
        continue