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