import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

import numpy as np

N,p = read().split()
N = int(N); p = float(p)

div_cnt = np.zeros(N+1,np.int32)

for x in range(1,int(N**.5)+10):
    if x * x > N:
        break
    div_cnt[x*x] += 1
    div_cnt[x*(x+1):N+1:x] += 2

div_cnt -= 2

counter = np.bincount(div_cnt[2:])

answer = sum(p ** i * x for i,x in enumerate(counter))
print(answer)