题解 | #牛牛学数列2#

递龟

def f(n):
    if n == 1:
        return 1
    return 1/n + f(n-1)

n = int(input())
print(f'{f(n):.6f}')

normal

n = int(input())

sum = 0
for i in range(1,n+1):
     sum += 1/i

print(f'{sum:.6f}')