37

def f(n, cnt):
    if cnt < 900:
        if n <= 5:
            return n
        if n % 3 == 0:
            return n + f(n//3+1, cnt + 1)
        else:
            return n + f(n+3, cnt + 1)
    else:
        return 0

for i in range(0, 10000):
    if f(i, 0) > 1000:
        print(i)
        break