N = int(input())

s = 0
for i in range(1,N+1):
    if i%2 != 0:
        s += 1
print(s/N) N = int(input()) N int(input()) int input() input s = 0 s 0 for i in range(1,N+1):
    if i%2 != 0:
        s += 1 i range(1,N+1) range 1 N+1 N 1 if i%2 != 0:
        s += 1 i%2 != 0 i%2 i 2 0 s += 1 s 1 print(s/N) print s/N s N N = int(input()) int(input()) N s += 1 1 s s = 0 0 s
N = int(input())

s = 0
for i in range(1,N+1):
    if i%2 != 0:
        s += 1
print(s/N)