Robot task

100 empty boxes are in a straight line and are number from 1 to100 according to their positions there is a robot whose task is to put a ball in the box ,if it is empty or if it already has one then it takes the ball . the robot first visits the boxes whose number is a multiple of "1" then it visits multiples of "2" then 3,4,5,6,..........................upto multiples of 100.how many boxes will be empty after the whole task is finished ?

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