n = int(input())
nn = []
odd = 0
for i in range(1, n+1):
    if i % 2 == 1:
        odd += 1
    nn.append(i)
s = len(nn)
print(odd/s) n = int(input()) n int(input()) int input() input nn = [] nn [] odd = 0 odd 0 for i in range(1, n+1):
    if i % 2 == 1:
        odd += 1
    nn.append(i) i range(1, n+1) range 1 n+1 n 1 if i % 2 == 1:
        odd += 1
     i % 2 == 1 i % 2 i 2 1 odd += 1 odd 1 nn.append(i) nn.append nn append i s = len(nn) s len(nn) len nn print(odd/s) print odd/s odd s nn = [] [] nn s = len(nn) len(nn) s n = int(input()) int(input()) n odd = 0 0 odd odd += 1 1 odd
n = int(input())
nn = []
odd = 0
for i in range(1, n+1):
    if i % 2 == 1:
        odd += 1
    nn.append(i)
s = len(nn)
print(odd/s)
