1355. 
The 2007 AMC10 will be scored by awarding points for each correct response, points for each incorrect response, and points for each problem left unanswered. After looking over the problems, Sarah has decided to attempt the first and leave only the last unanswered. How many of the first problems must she solve correctly in order to score at least points?
This problem is copyrighted by the American Mathematics Competitions.

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