{"raw_statement":[{"iden":"problem statement","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."},{"iden":"constraints","content":"*   $1 \\leq N \\leq 10^5$\n*   $0 \\leq K \\leq N-1$\n*   All input values are integers."},{"iden":"input","content":"Input is given from Standard Input in the following format:\n\n$N$ $K$"},{"iden":"sample input 1","content":"5 2"},{"iden":"sample output 1","content":"7\n\nThere are seven possible pairs: $(2,3),(5,3),(2,4),(3,4),(2,5),(3,5)$ and $(4,5)$."},{"iden":"sample input 2","content":"10 0"},{"iden":"sample output 2","content":"100"},{"iden":"sample input 3","content":"31415 9265"},{"iden":"sample output 3","content":"287927211"}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}