{"problem":{"name":"Horizon","description":{"content":"Assuming that the horizon seen from a place $x$ meters above the ground is $\\sqrt{x(12800000+x)}$ meters away, find how many meters away the horizon seen from a place $H$ meters above the ground is.","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"abc239_a"},"statements":[{"statement_type":"Markdown","content":"Assuming that the horizon seen from a place $x$ meters above the ground is $\\sqrt{x(12800000+x)}$ meters away, find how many meters away the horizon seen from a place $H$ meters above the ground is.\n\n## Constraints\n\n*   $1 \\leq H \\leq 10^5$\n*   $H$ is an integer.\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$H$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"abc239_a","tags":[],"sample_group":[["333","65287.907678222\n\nWe have $\\sqrt{333(12800000+333)} = 65287.9076782\\ldots$. Outputs such as `65287.91` would also be accepted."],["634","90086.635834623\n\nWe have $\\sqrt{634(12800000+634)} = 90086.6358346\\ldots$."]],"created_at":"2026-03-03 11:01:13"}}