box of landmines, each of which has the same weight and is an integer greater than 1, has a net weight of 201 kilograms after removing the box, and 183 kilograms after taking out several mines. How many kilograms does a landmine weigh?
一箱地雷，每个地雷的重量相同，且都是超过1的整千克数，去掉箱子后地雷净重201千克，拿出若干个地雷后，净重183千克．则一个地雷的重量是几千克？
<result>3</result>