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.

Constraints

• $1 \leq N \leq 10^5$
• $0 \leq K \leq N-1$
• All input values are integers.

Input

Input is given from Standard Input in the following format:

N K

Output

Print the number of possible pairs that he may have had.

Examples

Input

5 2

Output

7

Input

10 0

Output

100

Input

31415 9265

Output

287927211

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