# your code goes here
nums = [1,1,1,1,2,2] 
k1 = 1
k2 = 3
c1 = 0
c2 = 0
ans = 0
for j in range(1,len(nums)-2):
	for i in range(0,j-1):
		if(nums[i]+nums[j]>k1):
			c1 += 1
	k = j+1
	l = len(nums)-1
	while(l>k):
		if(nums[k]+nums[l]>k2):
			c2 += 1
			l -= 1
		else:
			k += 1
	ans += c1*c2
print(ans)