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[問題]
ユキさんは最近、カフェインの摂りすぎで、体調を崩してしまいました。
そこで、1日に摂取していいカフェインの量を調べたところ、1日あたり5.7mg/kgでした。
体重Akgの人は何mgまで摂取してよいか求めよ。

コード

$input = fgets(STDIN);
echo 5.7*$input, PHP_EOL;

↓ 62と入力

結果

353.4
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