Codeforces 546A Soldier and Bananas Solution in C

1. #include<stdio.h>
2. int main()
3. {
4. int i,a,c;
5. long int b,x=0;
6. scanf("%d%ld%d",&a,&b,&c);
7. for (i=1;i<=c;i++)
8. {
9. x=x+i*a;
10. }
11. if (x>b) printf("%ld\n",x-b);
12. else printf("0\n");
13. return 0;
14. }