China mathematical olympiad for primary school pupils title,subtle and underhand

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In a paper written 94 natural numbers 1,2,3,4,5,6,7……………………93,94. drawn to the top two numbers 1,2 and 3 to write them and in the final surface,to become :3,4,5,6,7,………………93,94,3 and then crossed out the top of two numbers 3,4,and 7 put them in writing in the back ,to become 5,6,7,………………,94,3,7. similarly to continue,too:7,…………………………94,3,7,11 this has always been to go on until the remaining number until the last one ,seeking to write all the numbers(including the orignal 94 number) and how much? as always,i issued a lament lament : primary five students to do this kind of problems ,it is sad China’s 1.3 billion population ,hundreds of thousands of people of insight have gone to the subtle and underhanded “ mathematics olympiad for primary schools are bind to how ah???