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>

int main(void)
{
    int N;
    scanf("%d",&N);
    int i,L[N];
    for(i=0;i<N;i++){
        scanf("%d",&L[i]);
    }
    int a,b,c;
    int count = 0;
    for(a=0;a<N-2;a++){
        for(b=a+1;b<N-1;b++){
            for(c=b+1;c<N;c++){
                if((L[a]<L[b]+L[c]) && (L[b]<L[a]+L[c]) && (L[c]<L[a]+L[b]))
                count++;
            }
        }
    }
    printf("%d\n",count);
}