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