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 Fortran (GNU Fortran 9.2.1) (judge verdict: Accepted)

program abc7
 implicit none
 integer::L,R,d,s,i
 read(*,*)L,R,d
 do i=L,R
  if(mod(i,d)==0)then
   s=s+1
  end if
 end do
 print'(i0)',s
end program abc7