N,P=raw_input().split()
N=int(N)
P=float(P)
isPrime=[1.0 for i in xrange(1000001)]
isPrime[0]=0
isPrime[1]=0
ans=0
for i in range(2,N+1):
    #print i,isPrime[i]
    ans+=isPrime[i]
    for j in range(i+i,N+1,i):
        isPrime[j]*=(1-P)
print ans