n,k=list(map(int,input().split()))
A=[]
B=[]
for i in range(1,n+1):
    if i%k==0: 
        A.append(i)#用的append接收，但是pycharm没有接收到数
    else:
        B.append(i)
def Get_aswavg():
    sum=0
    for intem in list:
        sum+=item
        return sum/len(list)
aws1=Get_aswavg(A)
aws2=Get_aswavg(B)
print('%1f'%asw1,end=' ')
print('%1f'%asw2,end=' ')