import sys
from math import floor

sys.setrecursionlimit(10 ** 7)
input = sys.stdin.readline
f_inf = float('inf')
mod = 10 ** 9 + 7


def resolve():
    def f(n, k):
        res = 0
        for i in range(1, k):
            res += 1 / pow(i, n)
        return res

    x = int(input())

    res = 0
    for i in range(x, x + 100):
        res += f(i, 1000) - 1

    print(floor(res * 10 ** 6))


if __name__ == '__main__':
    resolve()