View Code of Problem 27

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