Zag 想通过投资比特币来赚点钱。
他在比特币单价为 $x$ 时，花了 $n$ 美元购买比特币，并在单价为 $y$ 时将其全部卖出。请帮助他计算他总共赚了多少钱。
输入包含三个实数 $n, x, y$ ($1 \le n \le 10^5, 0 < x, y \le 10^3$)。
输出一行一个实数，表示他的利润。如果你的答案的绝对误差或相对误差不超过 $10^{-4}$，则被视为正确。
1256.80 2.1606 2.4451
165.49088216
20.00 2.9872 2.8662
-0.81012319
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