x = [1,0,1,2,10,5]
k = 3
prefix = [0] * len(x)

prefix[0] = x[0]

for i in range(1, len(x)):
	prefix[i] = prefix[i-1]+x[i]

count = 0
for j in range(1, len(x)):
	for i in range(0, j):
		if prefix[i] == prefix[j]-k:
			count+=1
print(count)