n,p=list(raw_input().split())
N,P=int(n),float(p)
l=[0,0]+[1.0]*(N-1)
s=0
q=1-P
for i in range(2,N+1):
    s+=l[i]
    for j in range(i+i,N+1,i):
        l[j]*=q
print(s)