View Code of Problem 27

#include <stdio.h>
int main(){
	int a,b,c[1000],i,j,sum,k;
	while(scanf("%d %d",&a,&b)!=EOF){
		sum=0;
		for(i=a+1;i<b;i++){
		k=0;
		for(j=2;j<i;j++){
			if(i%j==0)
			k++;
		}
		if(k==0)
		sum+=i;
	}
		printf("%d\n",sum);
	}
}