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- #include <stdio.h>
- int main ()
- {
- int x, i, sum = 0;
- scanf ("%d", &x);
- if(x > 0) {
- for(i = 1; i <= x; i++) {
- sum = sum + i;
- }
- printf("%d\n", sum);
- }
- else if(x <= 0) {
- for(i = x; i <= 1; i++) {
- sum = sum + i;
- }
- printf("%d\n", sum);
- }
- return 0;
- }
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