View Code of Problem 27

#include<stdio.h>
#include<math.h>
int main()
{
	int a,b,t;
  	int i,j,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;
}