{"problem":{"name":"Uneven Numbers","description":{"content":"Given is an integer $N$. Find the number of positive integers less than or equal to $N$ that have an odd number of digits (in base ten without leading zeros).","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"abc136_b"},"statements":[{"statement_type":"Markdown","content":"Given is an integer $N$. Find the number of positive integers less than or equal to $N$ that have an odd number of digits (in base ten without leading zeros).\n\n## Constraints\n\n*   $1 \\leq N \\leq 10^5$\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$N$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"abc136_b","tags":[],"sample_group":[["11","9\n\nAmong the positive integers less than or equal to $11$, nine integers have an odd number of digits: $1, 2, \\ldots, 9$."],["136","46\n\nIn addition to $1, 2, \\ldots, 9$, another $37$ integers also have an odd number of digits: $100, 101, \\ldots, 136$."],["100000","90909"]],"created_at":"2026-03-03 11:01:13"}}