View Code of Problem 27

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