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- #include <stdio.h>
- void main() {
- int k,w;
- long long p,sum,n;
- scanf("%d %lli %d",&k,&n,&w);
- sum=0;
- for(int i=1 ; i<=w; i++)
- {
- sum=sum+i;
- }
- p=k*sum;
- if((n-p)>0)
- printf("0");
- else
- printf("%lli",p-n);
- }
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