OJ Board

please anyone help me everytime got time limit
#include<stdio.h>
int main()
{
int i,n,m,p,q,j,r,a[10000],b,c,k,o;
a[1]=1;
while(scanf("%d %d",&n,&m)==2)
{
k=2;
for(j=1; j<=n; j++)
{
r=j;
p=0;
q=r-2;
for(i=2; i<=r; i++)
{
if(r%i!=0)
p++;
}
if(p==q)
a[k++]=j;
}
k=k-1;
if(k%2==0)
o ...