n=int(input())
k=[i for i in range(1,n+1,2)]
print(len(k)/n) n=int(input()) n int(input()) int input() input i for i in range(1,n+1,2) for i in range(1,n+1,2) i range(1,n+1,2) range 1 n+1 n 1 2 for i in range(1,n+1,2) i k=[i for i in range(1,n+1,2)] k [i for i in range(1,n+1,2)] print(len(k)/n) print len(k)/n len(k) len k n n=int(input()) int(input()) n k=[i for i in range(1,n+1,2)] [i for i in range(1,n+1,2)] k
n=int(input())
k=[i for i in range(1,n+1,2)]
print(len(k)/n)