Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 25897    Accepted Submission(s): 11321

30
26
0

3
2

#include<stdio.h>
#include<math.h>
int f(int x)
{
 int i;
 for(i=2;i<=sqrt(x);i++)
 if(x%i==0)
 return 0;
 return 1;
}
main()
{
 int a,b,i,l,n,m;
 while(scanf("%d",&n)&&n!=0)
 {
    l=0;
 for(i=2;i<n-i;i++)
 if(f(i)&&f(n-i))
 l++;
 printf("%d\n",l);
    }
 return 0;
}