Problem:
Score : 100 points

Problem Statement

How many multiples of d are there among the integers between L and R (inclusive)?

Constraints

All values in input are integers.

1 \leq L \leq R \leq 100

1 \leq d \leq 100

Input

Input is given from Standard Input in the following format:

L R d

Output

Print the number of multiples of d among the integers between L and R (inclusive).

Sample Input 1

5 10 2

Sample Output 1

3

Among the integers between 5 and 10, there are three multiples of 2: 6, 8, and 10.

Sample Input 2

6 20 7

Sample Output 2

2

Among the integers between 6 and 20, there are two multiples of 7: 7 and 14.

Sample Input 3

1 100 1

Sample Output 3

100

Solution in PyPy3 (7.3.0) (judge verdict: Accepted)

import sys
import bisect
import itertools
import collections
import fractions
import heapq
import math
from operator import mul
from functools import reduce
from functools import lru_cache


def solve():
    readline = sys.stdin.buffer.readline
    mod = 10 ** 9 + 7

    L, R, d = map(int, input().split())
    ans = 0
    for i in range(L, R+1):
        if i % d == 0:
            ans += 1
    print(ans)


if __name__ == '__main__':
    solve()