View Code of Problem 27

#include<stdio.h>
#include<math.h>
#include<stdlib.h>


int main(){
	
	int a,b,sum=0;
	while(scanf("%d%d",&a,&b)!=EOF){
			for(int i=a+1;i<b;i++)
			{
				int k=0;
				for(int j=2;j<i;j++){
					if(i%j==0){k=1;break;}
				
				}
				if(k==0)sum+=i;
			
			}
			printf("%d\n",sum);
		
	
	
	}



}