[CodeForces][JAVA] 158A.Next Round

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.StringTokenizer;
 
 
public class Solution {
        
    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    private static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
    
    public static void main(String[] args) throws IOException{
        StringTokenizer stk = new StringTokenizer(br.readLine());
        int N = Integer.parseInt(stk.nextToken());
        int K = Integer.parseInt(stk.nextToken());
        
        String[] point = br.readLine().split(" ");
        
        int num_k = Integer.parseInt(point[K-1]);
        int result = 0;
        
        for(int i=0; i<N; i++) {
            int num_i = Integer.parseInt(point[i]);
            if(num_i>0) {
                if(num_i>=num_k) result++;
                else break;
            }
            else break;
            
        }
        System.out.println(result);
    }
}