N=int(input())
odd=0
for i in range(N+1):
    if i%2==0:
        continue
    else:
        odd+=1.0000
print(float(odd/N)) N=int(input()) N int(input()) int input() input odd=0 odd 0 for i in range(N+1):
    if i%2==0:
        continue
    else:
        odd+=1.0000 i range(N+1) range N+1 N 1 if i%2==0:
        continue
    else:
        odd+=1.0000 i%2==0 i%2 i 2 0 continue odd+=1.0000 odd 1.0000 print(float(odd/N)) print float(odd/N) float odd/N odd N odd+=1.0000 1.0000 odd N=int(input()) int(input()) N odd=0 0 odd
N=int(input())
odd=0
for i in range(N+1):
    if i%2==0:
        continue
    else:
        odd+=1.0000
print(float(odd/N))