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