View Code of Problem 27

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