In this problem, most of the solution was used by lambda.
I have no idea why? You can easily use regular normal python syntax and data structures. My solution with python is as follows:
participents_count, position = map(int, input().split(' '))
total_advanced = 0
scores = list(map(int, input().split(' ')))
for point in scores:
if point >= scores[position-1] and point != 0:
total_advanced += 1
print(total_advanced)
The complex part to me was understanding the second integer of the first line. Actually it was teling about the position the participents input to be calculated