View Code of Problem 27

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
int main() {
	int a,b,i,j;
	while(scanf("%d %d",&a,&b)!=EOF){
		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=sum+i;
			}
		}
		printf("%d\n",sum);
	}
}