9
1,2,3,4,5

2

target = int(input())
nums = input().strip().split(',')
count = 0
for i in range(len(nums)):
    for j in range(i + 1, len(nums)):
        for k in range(j + 1, len(nums)):
            if int(nums[i]) + int(nums[j]) + int(nums[k]) == target:
                count += 1
print(count)