You are given nonnegative integers a and b (a ≤ b), and a positive integer x. Among the integers between a and b, inclusive, how many are divisible by x?
a,b,x=map(int,input().split())
if a%x:
  print(b//x-a//x+1)
else:
  print(b//x-a//x)
a,b,x=map(int,input().split())
c=(b//x-a//x)
if a%x==0:
  print(c+1)
else:
  print(c)
