# b_tricky_test.py

# b_tricky_test.py

def test(i):
    if not i % 10:
        low = min(seen)
        for num in range(low, max(seen) + 2):
            if num not in seen:
                seen.discard(low)
                return num
    return (i // 2) + (i + 3)

i = 1
pattern = []
seen = set()

while 1:
    print(i)
    pattern.append(i)
    seen.add(i)
    i = test(i)