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Astrid is in charge of building a new fleet of ships. Each ship requires $x$ tons of wood, and accommodates $y$ sailors. She receives a delivery of $z$ tons of wood each day. The deliveries can continue for $n$ days at most, afterwards the weather is too bad to allow them. Overall, she wants to build enough ships to accommodate at least $m$ sailors. How much wood does Astrid need to accommodate $m$ sailors? $w$ tons