n=int(input())
count=0
for i in range(0,n):
	if(i%2==0):
			count+=1
			
	else:
		count+=0
	
print(count/n) n=int(input()) n int(input()) int input() input count=0 count 0 for i in range(0,n):
	if(i%2==0):
			count+=1
			
	else:
		count+=0
	 i range(0,n) range 0 n if(i%2==0):
			count+=1
			
	else:
		count+=0
	 i%2==0 i%2 i 2 0 count+=1 count 1 count+=0 count 0 print(count/n) print count/n count n count+=1 1 count count=0 0 count n=int(input()) int(input()) n count+=0 0 count
n=int(input())
count=0
for i in range(0,n):
	if(i%2==0):
			count+=1
			
	else:
		count+=0
	
print(count/n)
