URI 1149 Solution

#include <stdio.h>

int main()

{

   int N,A,i,t=0,count=0;

   scanf("%d %d",&A,&N);

   while(N<=0) scanf("%d",&N);

   for(i=A;;i++)

   {

       t=t+i;

       count++;

       if(count==N)break;

   }

   printf("%d
",t);

    return 0;

}