def main():
	n = int(input())
	k = int(input())
	arr = [int(input()) for _ in range(n)]
	prefix = {}
	count = 0
	sum = 0
	prefix[0] = 1
	for num in arr:
		sum+=num
		if (sum-k) in prefix:
			count+=prefix[sum-k]
		
		if sum in prefix:
			prefix[sum]+=1
		else:
			prefix[sum] = 1
		
	print(count)
	
if __name__=="__main__":
	main()