A=0

B=0

N=0

M=0

a,b=map(int,input().split())

for i in range(1,a+1):

 if i%b==0:
     A+=i
     N=N+1
 else:
     B+=i
     M=M+1

print(format(A/N,'.1f'));print(format(B/M,'.1f'))