|
a=int(input())
|
|
s=0
|
|
d=1
|
|
e=0
|
|
if a%2==0:
|
|
e=int(a/2)
|
|
else:
|
|
e=int(a/2+0.5)
|
|
for i in range(1,e+1):
|
|
if i%2==0:
|
|
s-=1/d
|
|
else:
|
|
s+=1/d
|
|
d+=2
|
|
print(round(s,8))
|
|
|
|
|
|
count=1
|
|
sum=0
|
|
for i in range(1,a+1,2):
|
|
if count%2:
|
|
sum+=1/i
|
|
else:
|
|
sum-=1/i
|
|
count+=1
|
|
print(round(sum,8))
|
|
|