Circle Pond

AtCoder

IDabc163_a

Time2000ms

Memory256MB

Difficulty—

Print the circumference of a circle of radius $R$. ## Constraints * $1 \leq R \leq 100$ * All values in input are integers. ## Input Input is given from Standard Input in the following format: $R$ [samples]

Samples

Input #1

Output #1

6.28318530717958623200

Since we accept an absolute or relative error of at most $10^{-2}$, $6.28$ is also an acceptable output, but $6$ is not.

Input #2

Output #2

458.67252742410977361942

API Response (JSON)

{
  "problem": {
    "name": "Circle Pond",
    "description": {
      "content": "Print the circumference of a circle of radius $R$.",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "abc163_a"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "Print the circumference of a circle of radius $R$.\n\n## Constraints\n\n*   $1 \\leq R \\leq 100$\n*   All values in input are integers.\n\n## Input\n\nInput is given from Standard Input in the following format:...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

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