Problem	eescapism
User	birdbird
Submission Time	2026-08-16 17:07:57
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

eescapism.cpp: In function ‘long long int sumall(long long int)’:
eescapism.cpp:6:16: error: expression cannot be used as a function
6 | return (x+1)(x)/2;
| ^