View Code of Problem 27

#include<stdio.h>
#include<math.h>
int main()
{
	int a,b,t,i,j;
  	int sum;
  	while(scanf("%d %d",&a,&b)!=EOF)
        {
          if(a>b){t=a;a=b;b=t;}
          sum=0;
          for(i=a+1;i<b;i++)
          {
          	if(i==1)continue;
            	for(j=2;j<=sqrt(i);j++)
                {
                	if(i%j==0)
                          break;
                }
            	if(j>sqrt(i))
                {
                	sum+=i;
                }
          }
          printf("%d\n",sum);
        }
  	return 0;
}