# 愚直実装

N, prob = map(float, input().split())
N = int(N)

survive = [1]*(N+1)
survive[0]=0
survive[1]=0
for p in range(2, N+1):
    for j in range(p*2, N+1, p):
        #survive[j] *= (1-prob)*survive[p] これだとワークしない
        survive[j] *= (1-prob)
    #print('p', p, survive)
    
ans = sum(survive)
print(ans)