OJ Board

Hi everybody,
I get A time limit exceeded but i don't know why here is the problem & code:

problem :
http://online-judge.uva.es/contest/data/next/problemset/k.html

Code :

#include <stdio.h>
#include <stdlib.h>

int main()
{
int i,j,a;
int ter[20];
long int n;

scanf("%d",&n);
while(n ...