Heads I win, Tails you lose

John has 3 unique coins such that the probability of obtaining a head when the coin is flipped is \(\frac{1}{10}\), \(\frac{2}{10}\) and \(\frac{3}{10}\), respectively. If he flips each of the 3 coins once, the probability that at least 1 heads appears is \(p\). What is the value of \(1000p \)?

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