n = int(input())
odd = 0
for i in range(1,n+1):
    odd += i%2 != 0
print(odd/n) n = int(input()) n int(input()) int input() input odd = 0 odd 0 for i in range(1,n+1):
    odd += i%2 != 0 i range(1,n+1) range 1 n+1 n 1 odd += i%2 != 0 odd i%2 != 0 i%2 i 2 0 print(odd/n) print odd/n odd n odd = 0 0 odd n = int(input()) int(input()) n odd += i%2 != 0 i%2 != 0 odd
n = int(input())
odd = 0
for i in range(1,n+1):
    odd += i%2 != 0
print(odd/n)