158A Next Round

#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;
const int maxn = 60;
int arr[maxn];

int main() {

    int ans = 0;
    int n, k;
    cin >> n >> k;
    for(int i = 1; i <= n; ++i) {
        cin >> arr[i];
    }
    for(int i = 1; i <= n; ++i) {
        if(arr[i] >= arr[k] && arr[i] > 0) {
            ans++;
        }
    }
    cout << ans << endl;
    return 0;
}