Mo and his Watches

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Mo the pro does not want to be late for the promo of Incident'14, the annual cultural fest of NITK. In his excitement, he drops his only 2 wrist watches. He sets his watches according to a wall clock. After some time N he discovers that one of the watch is X minutes fast, and the other watch is Y minutes slow. What is the minimum time(in minutes) after which both the watches show the same time ?

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solution.cppC++17

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