View Code of Problem 27

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