{"problem":{"name":"Pair","description":{"content":"Find the number of ways to choose a pair of an even number and an odd number from the positive integers between $1$ and $K$ (inclusive). The order does not matter.","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"abc108_a"},"statements":[{"statement_type":"Markdown","content":"Find the number of ways to choose a pair of an even number and an odd number from the positive integers between $1$ and $K$ (inclusive). The order does not matter.\n\n## Constraints\n\n*   $2\\leq K\\leq 100$\n*   $K$ is an integer.\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$K$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"abc108_a","tags":[],"sample_group":[["3","2\n\nTwo pairs can be chosen: $(2,1)$ and $(2,3)$."],["6","9"],["11","30"],["50","625"]],"created_at":"2026-03-03 11:01:13"}}