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#include <iostream>
using namespace std;
int i, j, k, N, a[1001], nr, aux;
int main(){
cin>>N;
for(i=1; i<=N; i++)
cin>>a[i];
for(i=1; i<N; i++)
for(j=i+1; j<=N; j++)
if(a[i]>a[j]){
aux=a[i];
a[i]=a[j];
a[j]=aux;
}
for(i=1; i<=N-2; i++)
for(j=i+1; j<=N-1; j++){
k=j+1;
while(a[i]+a[j]>a[k] && k<=N){
nr++;
k++;
}
}
cout<<nr;
return 0;
}