N,p = input().split(" ")
N = int(N)
p = float(p)
a = [0 for _ in range(N+1)]
for i in range(2,N+1):
    for j in range(i*2,N+1,i):
        a[j] += 1
e = 0
for i in range(2,N+1):
    if a[i] == 0:
        e += 1
    else:
        e += (1-p)**a[i]
print(e)