n = int(input("n = "))
s = 0
for i in range(1,n+1):
    s += i
print("s = ", s)

    =============== RESTART: C:\The Sum of 1 to n.py ==============
    n = 5
    s = 15
>>>
    =============== RESTART: C:\The Sum of 1 to n.py ==============
    n = 100
    s = 5050
>>>
    =============== RESTART: C:\The Sum of 1 to n.py ==============
    n = 167
    s = 14028
>>>
    =============== RESTART: C:\The Sum of 1 to n.py ==============
    n = 1000
    s = 500500