(2)
1 1 1 1 1 1 - 1 1 1 1 1 1 1 1 1 ( 13 ) 1 , 1 1 1 1 1 2 2 2 2 ( ) 2 ( ) 2 ( ) 2 2 ( ) 2 2 , 2 2 1000 ( ) 2 , ( ) 2 , 2 , ( ) 2 2 - 2 3 3 3 3 3 3 4 4 5 6
