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)*(10**6)
    ans+=tmp
if x==2:
    print(999999)    
else:
    print(math.floor(ans))