S = 15
arr = [5, 1, 3, 5, 10, 7, 4, 9, 2, 8]

start = 0
current_sum = 0
min_len = len(arr) + 1

for end in range(len(arr)):
    current_sum += arr[end]

    while current_sum >= S:
        length = end - start + 1
        if length < min_len:
            min_len = length

        current_sum -= arr[start]
        start += 1

if min_len == len(arr) + 1:
    print(0)
else:
    print(min_len)