SOS giúp code python nha

l = int(input())
r = int(input())
k = int(input())
ssh = (r // k) - ((l - 1) // k)
l = (l + k - 1) // k
r = r // k
s = ssh * (l + r) * k // 2
print(s)

$\color{#23d78c}{\texttt{P}}\color{#9ee36f}{\texttt{y}}\color{#10c1ed}{\texttt{t}}\color{#10c1ed}{\texttt{h}}\color{#c6ea64}{\texttt{o}}\color{#fbfb45}{\texttt{n}}$

def S(l, r=None):
    if r is None:
        l //= k
        return k * l * (l+1) // 2
    return S(r) - S(l-1)
l = int(input())
r = int(input())
k = int(input())
print(S(l, r))

# Author : Daoanhviet96
# Language : Python3

$\\$
\begin{array}{c|c|c}\color{#ffd710}{\texttt{\{}} \color{#8655d6}{\texttt{\{}}\ \ \color{#8cdcda}{\text{Daoanhviet96}}\ \ \color{#8655d6}{\texttt{\}}} \color{#ffd710}{\texttt{\}}}\end{array}