Uri/Beecrowd problem no - 1149 solution in C
#include <stdio.h>
int main() {
int A, N, sum = 0;
scanf("%d %d", &A, &N);
while (N <= 0) {
scanf("%d", &N);
}
for (int i = 0; i < N; i++) {
sum += A + i;
}
printf("%d\n", sum);
return 0;
}