View Code of Problem 27

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