喺 Manhattan，對每個整數 $i$，都有街道 $x = i$ 同 $y = i$。已知 Snuke 同 Smeke 嘅屋都喺街道上，而且兩間屋之間嘅歐幾里得距離啱啱係 $d$。計算沿住街道行嗰陣，兩間屋之間距離最大可以係幾多。
輸入包含一個數 $d$。
$0 < d \le 10$
$d$ 嘅小數點後面啱啱有三位數字。
輸出答案。如果答案嘅絕對誤差或者相對誤差唔超過 $10^{-9}$，就會當係正確。
1.000
2.000000000000
2.345
3.316330803765
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