n = int(input())
print(2**n - 1)
def hanoi(n, st, aux, to):
if n == 1:
print(f'{st} {to}')
return
hanoi(n-1, st, to, aux)
print(f'{st} {to}')
hanoi(n-1, aux, st, to)
hanoi(n, '1', '2', '3')
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