a=0
b=0
z=3
x=5
c=0


1.upto(1000) do |number|
      if (number%z)==0 and (number%x)==0
         c=c+number
      else
         next
   end
      if (number%x)==0
         b=b+number
      else
         next
   end
      if (number%z)==0
         a=a+number
   else
      next
   end
end
#p a
#p b
p (a+b)-c