Codeforce - 158A - Next Round

n, k = map(int, raw_input().strip().split() )
seq = map(int, raw_input().strip().split() )

score = seq[k - 1]

if score == 0:
    counter = 0
    for i in range(0, k):
        if seq[i] > score:
            counter += 1
    print counter
 
else:
    counter = k
    for i in range(k, n):
        if seq[i] >= score:
            counter += 1
        else:
            break
    print counter