N,P = map(str,input().split())
N = int(N)
P = float(P)

ans = [1]*(N+1)
ans[0] = 0
ans[1] = 0

for i in range(2,N+1):
    nex = i
    for j in range(2,10**7):
        if nex*j > N:
            break
        ans[nex*j] *= (1-P)

print(sum(ans))