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