HDU 1301 Doubles

#include<iostream>
using namespace std;

int main()
{
	int num[20],temp,i,j,count,sum;	
	
	while(scanf("%d",&num[0])&&num[0]!=(-1))
	{
		count=sum=0;
	    for(i=1;scanf("%d",&temp),i<=15&&temp!=0;i++)
		{
		
		
				num[i]=temp;
				count++;
		
		}
		


		for(i=0;i<count;i++)
			for(j=i+1;j<=count;j++)
			  if(num[i]==num[j]*2||num[j]==num[i]*2)
				sum++;
        printf("%d\n",sum);
	}
	return 0;
}