#include <stdio.h>

int main()
{
	int i, k, B, N, K, p[173];
	scanf("%d %d", &N, &K);
	for (i = 1; i <= N; i++) scanf("%d", &(p[i]));
	for (B = 0; B <= 400; B++) {
		for (i = 1, k = 0; i <= N; i++) if (p[i] >= B) k++;
		if (k <= K) break;
	}
	if (B <= 400) printf("%d\n", k);
	else printf("0\n");
	fflush(stdout);
	return 0;
}