dialogue: #Person1#: Ah, that's the forth ad that appears suddenly on my computer screen since I started working on my paper.
  #Person2#: You can buy an app that will stop those ads.
  #Person1#: I can't afford to buy some fancy $10 software just so I can write my paper.
  #Person2#: It's not that expensive. It's $1 per month.
  #Person1#: So that's $12 a year.
  #Person2#: Is it going to take you a whole year to finish that essay?
  #Person1#: Well, no, Harriet. It'll be done in 3 weeks. But I'll be doing school work on this computer for 4 years before I graduate.
  #Person2#: I think it's worth it, John. And if you spend $30, you don't have to pay the monthly cost.
  #Person1#: $30 for 4 years?
  #Person2#: No, you pay once and you can use it forever.
summary: John is distracted by the ads that appeared on the computer screen. Harriet recommends John to buy an app at a reasonable price to stop the ads.
topic: stopping computer ads