[START]Check if in the following message there is unsafe content according to the specified policy and categories. Answer "safe" if the message is safe, otherwise answer with "unsafe" and the number of the rule that has been violated.
[BOR]
0: Safe
1: Please only post links to actual news sources, no tabloid sites, etc
2: No NSFW content
3: No hate speech, bigotry, propaganda, etc

[EOR]
[BOC]
Even though aircraft need retrofits, it's actually had a very minor impact on cost. [The total cost of concurrency for the JSF program is less than $2 billion.](http://www.flightglobal.com/news/articles/f-35-concurrency-cost-rises-slightly-but-trend-stabilises-411882/)

[This is what that looks like as a fraction of the total program cost.](http://i.imgur.com/Qlacls7.png)
[EOC]
safe
0
[END]

Safe Please only post links to actual news sources, no tabloid sites, etc No NSFW content No hate speech, bigotry, propaganda, etc