View Code of Problem 27

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

int count(int x){
	if(x==1) return 0;
	for(int i=2; i<=sqrt(x); i++){
		if(x%i==0) return 0;
	}
	return 1;
}

int main(){
	int a,b,temp;
	long long sum;
	//输入：2个整数，0<=a,b<=65536
	while(scanf("%d %d", &a, &b)!=EOF){
		sum=0; 
		if(a>b){
			temp = a;
			a = b;
			b = temp;
		} 
		for(int i=a+1; i<b; i++){
			if(count(i)==1){
				sum+=i;
			}
		}
		printf("%lld\n", sum);
	}
	//处理 
	//输出：1个长整数 
	
}