View Code of Problem 27

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