n = int(input())

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

c = 0
for i in range(1,n+1):
  if(i%2 == 1):
    c = c + 1
print(c/n)