11 lines
184 B
C
11 lines
184 B
C
#include <stdio.h>
|
|
|
|
int main() {
|
|
int n, cnt = 0, i;
|
|
scanf("%d", &n);
|
|
for (i = 1; i <= n; i++) {
|
|
cnt += (1 + i) * i / 2;
|
|
}
|
|
printf("%d", cnt);
|
|
return 0;
|
|
} |