Problem:
Score : 400 points

Problem Statement

Takahashi has N sticks that are distinguishable from each other. The length of the i-th stick is L_i.

He is going to form a triangle using three of these sticks. Let a, b, and c be the lengths of the three sticks used. Here, all of the following conditions must be satisfied:

a < b + c

b < c + a

c < a + b

How many different triangles can be formed? Two triangles are considered different when there is a stick used in only one of them.

Constraints

All values in input are integers.

3 \leq N \leq 2 \times 10^3

1 \leq L_i \leq 10^3

Input

Input is given from Standard Input in the following format:

N
L_1 L_2 ... L_N

Constraints

Print the number of different triangles that can be formed.

Sample Input 1

4
3 4 2 1

Sample Output 1

1

Only one triangle can be formed: the triangle formed by the first, second, and third sticks.

Sample Input 2

3
1 1000 1

Sample Output 2

0

No triangles can be formed.

Sample Input 3

7
218 786 704 233 645 728 389

Sample Output 3

23

Solution in C (GCC 5.4.1) (judge verdict: Time Limit Exceeded)

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

int main()
{

  int i,j,k;
  int N;
  scanf("%d",&N);

  int L[N+1];
  int count=0;
    
  for(i=1;i<=N;i++){
    scanf("%d",&j);
    L[i] = j;
  }
  
  for(i=1;i<=N;i++){
    for(j=i+1;j<=N;j++){
      for(k=j+1;k<=N;k++){
        if( L[i]<(L[j]+L[k]) && L[j]<(L[i]+L[k]) && L[k]<(L[i]+L[j]) ){
          count++;
        }
      }
    }
  }
  
  printf("%d\n",count);
  
  return 0; 
}