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G - P-smooth number

Score : $600$ points

Problem Statement

A positive integer is called a $k$-smooth number if none of its prime factors exceeds $k$.
Given an integer $N$ and a prime $P$ not exceeding $100$, find the number of $P$-smooth numbers not exceeding $N$.

Constraints

• $N$ is an integer such that $1 \le N \le 10^{16}$.
• $P$ is a prime such that $2 \le P \le 100$.

Input

The input is given from Standard Input in the following format:

$N$ $P$

Output

Print the answer as an integer.

36 3

14

The $3$-smooth numbers not exceeding $36$ are the following $14$ integers: $1,2,3,4,6,8,9,12,16,18,24,27,32,36$.
Note that $1$ is a $k$-smooth number for all primes $k$.

10000000000000000 97

2345134674