import math
x=int(input())

ans=0

for j in range(x,3000):
    tmp=0
    for i in range(1,1000000):
        tmp+=1/(i**j)
        if i**j>10**17:
            break
    tmp=(tmp-1)
    ans+=tmp

if x==2:
    print(1000000)
else:
    print(math.floor((ans)*(10**6)))