s=0
t=0
n=int(input())
for x in range(1,n+1):
    if x%2==1:
        s+=1
print(s/n) s=0 s 0 t=0 t 0 n=int(input()) n int(input()) int input() input for x in range(1,n+1):
    if x%2==1:
        s+=1 x range(1,n+1) range 1 n+1 n 1 if x%2==1:
        s+=1 x%2==1 x%2 x 2 1 s+=1 s 1 print(s/n) print s/n s n s+=1 1 s n=int(input()) int(input()) n t=0 0 t s=0 0 s
s=0
t=0
n=int(input())
for x in range(1,n+1):
    if x%2==1:
        s+=1
print(s/n)