x = int(input())
import sys
if x == 2:
    print(10 ** 6)
    exit()
ans = 0
flag = False
i = 2
while not flag:
    tmp = 1
    for _ in range(x):
        tmp *= i
        if tmp > 10 ** 12:
            flag = True
            break
    ans += i / (i-1) / tmp
    i += 1
print(int(ans * 10 ** 6))