#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cmath>
#include <stdio.h>
#include <string.h>
#include <iomanip>
 
using namespace std;
#define all(v) (v.begin()), (v.end())
 
void fast_io(){
    ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
}
 
int main()
{
    fast_io();
    int n, k;
    cin >> n >> k;
    int participants[n];
    long long count = 0;
    for (int i = 0; i < n; i++){
        cin >> participants[i];
    }
    for (int i = 0; i < n; i++){
        if (participants[i] > 0 && participants[i] >= participants[k]){
            count++;
        }
    }
    cout << count << endl;
}

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

OCA1CjEwIDkgOCA3IDcgNyA1IDU=

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