View Code of Problem 27

#include<stdio.h>
#include<string.h>
#include<math.h>
int main()
{
    int a,b,i,j;
    while(scanf("%d%d",&a,&b)!=EOF&&a>=0&&b<=65536){
    	int sum=0;
    	for(i=a+1;i<b;i++){
    		for(j=2;j<=sqrt(i);j++){
    			if(i%j==0) 
    				break;
    			
    		}
    		if(j>sqrt(i)) 
    			sum+=i;
    	}
    	printf("%d\n",sum );
    }

    return 0;
}