{"problem":{"name":"Remainder Reminder","description":{"content":"Takahashi had a pair of two positive integers not exceeding $N$, $(a,b)$, which he has forgotten. He remembers that the remainder of $a$ divided by $b$ was greater than or equal to $K$. Find the numbe","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"arc091_b"},"statements":[{"statement_type":"Markdown","content":"Takahashi had a pair of two positive integers not exceeding $N$, $(a,b)$, which he has forgotten. He remembers that the remainder of $a$ divided by $b$ was greater than or equal to $K$. Find the number of possible pairs that he may have had.\n\n## Constraints\n\n*   $1 \\leq N \\leq 10^5$\n*   $0 \\leq K \\leq N-1$\n*   All input values are integers.\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$N$ $K$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"arc091_b","tags":[],"sample_group":[["5 2","7\n\nThere are seven possible pairs: $(2,3),(5,3),(2,4),(3,4),(2,5),(3,5)$ and $(4,5)$."],["10 0","100"],["31415 9265","287927211"]],"created_at":"2026-03-03 11:01:14"}}