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A corridor in turn fitted n (1 ≤ n ≤ 65535) light bulb, from start to finish No. 1,2,3, ... n-1, n. Each light bulb controlled by a pull switch. Start, lights all closed. There are n number of students from across the promenade. The number of students who first light switch in multiples of 1 pull then the number of students who second light switch pull multiple of 2 then a third of the number of students who multiples of three light switches pull case continues, the last n-th number of students who light switch to a multiple of n pull. n After a student has completed this provision, there Jizhan lamp lit corridor. Note: The number of students and the number of lamps in line.