include <bits/stdc++.h>

using namespace std;

int main()
{
int n , dt=0;
cin >> n ;
int a[n] ;
for(int i=0 ; i<n ; i++)cin >> a[i] ;
sort(a,a+n,greater<int>());
for(int i=1 ; i<n ; i++){
int h=a[i-1]-a[i] ;
for(int j=i+1 ; j<n ; j++){
if(h<a[j]){
dt++;
}
else break ;
}
}
cout << dt ;
return 0;

include <bits/stdc++.h>

using namespace std;
int main()
{
long long n,tong=0;
cin>>n;
for(long long i=1;i<=sqrt(n);i++)
if(n%i==0){
if(i==n/i)
tong=tong+i;
else
tong=tong+i+n/i;
}
if(tong/2==n)
cout<<"YES";
else
cout<<"NO";
return 0;
}

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