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class CountDiv

def self.solution(a, b, k)

first = a

(a..a+k).each do |i|

first = i

break if i % k == 0

end

return ((b-first)/k).floor + 1

end

result = CountDiv.solution(5, 5, 2)

puts "#{result}, pass: #{result == 0}"

result = CountDiv.solution(6, 11, 2)

puts "#{result}, pass: #{result == 3}"

result = CountDiv.solution(6, 11, 3)

puts "#{result}, pass: #{result == 2}"

result = CountDiv.solution(6, 11, 4)

puts "#{result}, pass: #{result == 1}"

result = CountDiv.solution(4, 16, 4)

puts "#{result}, pass: #{result == 4}"

result = CountDiv.solution(3, 16, 4)

puts "#{result}, pass: #{result == 4}"

result = CountDiv.solution(0, 2000000000, 2)

puts "#{result}, pass: #{result == 1000000001}"

# TESTED AND PASSED ON Codility