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- #include<stdio.h>
- int main()
- {
- int i;
- long int pice=1,j;
- while(scanf("%ld",&j)==1)
- {
- if(j>=0)
- {
- for(i=1; i<=j; i++)
- {
- pice=pice+i;
- }
- printf("%ld\n",pice);
- pice=1;
- }
- }
- return 0;
- }
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