n,p = input().split()
n = int(n)
p = float(p)
ans = 0
num = [0]*(n+1)
prob = [1]*1000
for i in range(1,1000): prob[i] = prob[i-1]*(1-p)
for i in range(2,n+1):
    ans += prob[num[i]]
    for j in range(i,n+1,i):
        num[j] += 1
print(ans)