#include<iostream>
#include<stdio.h>
#include<stdlib.h>
#include<string>
#include<cstring>
#include<string.h>
#include<math.h>
#include<algorithm>
#define inf 0x3f3f3f3f
#define LL long long
using namespace std;
int N=0;
const int maxn=2e5+5;
LL Arr[maxn]={0},temp[maxn]={0},sum=0;
void MergeSort(LL Arr[], int left,int mid, int right)
{
    int i=left,j=mid+1,len=right-left,flag=0,flag_vis=-1,index=0;
    while(i<=mid&&j<=right){
        if(Arr[i]>Arr[j]){
                if(flag_vis!=-1){
                    for(flag=flag_vis; flag<=mid; flag++){
                        if(Arr[flag]>2*Arr[j]){
                            sum+=mid-flag+1;
                            flag_vis=flag;
                            break;
                            }
                        }
                }
                else {
                    for(flag=i; flag<=mid;flag++){
                        if(Arr[flag]>2*Arr[j]){
                            sum+=mid-flag+1;
                            flag_vis=flag;
                            break;
                        }
                    }
                }
        temp[index++]=Arr[j]; j++;
        }
        else {
            temp[index++]=Arr[i]; i++;
        }
    }
    if(i>mid){
        while(j<=right){
            temp[index++]=Arr[j]; j++;
        }
    }
    else{
        while(i<=mid){
            temp[index++]=Arr[i];i++;
        }
    }
    for(int k=0;k<=len;k++){
        Arr[left+k]=temp[k];
    }
}
void Merge(LL Arr[], int left, int right)
{
    if(left<right){
        int mid=(left+right)/2;
        Merge(Arr,left,mid);
        Merge(Arr,mid+1,right);
        MergeSort(Arr,left,mid,right);
    }
}
int main()
{
    while(scanf("%d",&N)){
        if(N==0) break;
        for(int i=0;i<N;i++){
            scanf("%lld",&Arr[i]);
        }
        sum=0;
        Merge(Arr,0,N-1);
        printf("%lld\n",sum);
    }
return 0;
}