#!/usr/bin/env python3
import sys

def main():
    import bisect
    # N = int(input())
    N, K = map(int,input().split())
    P = list(map(int,input().split()))
    P.sort()
    for B in range(400):
        num = N - bisect.bisect_left(P, B)
        # print(B, num, bisect.bisect_left(P, B))
        if num <= K:
            print(num)
            return
    return

if __name__ == '__main__':
    main()