Problem7197--数列求值6

7197: 数列求值6

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Time Limit : 1.000 sec  Memory Limit : 256 MiB

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Description

Input 

						

					

					
					

						

							

								Sample 1 Input 
								
							

						

						
22

						

					

										

						

							

								Sample 1 Output								
							

						

						
0.671

						

											

										

						

							

								Sample 2 Input 
								
							

						

						
1

						

					

										

						

							

								Sample 2 Output								
							

						

						
1.000

						

																

																

														

															

										

						

							

								Source/Category							

						


						

							 	          


					

					
				
			

				
				

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