#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/detail/standard_policies.hpp>
using namespace std;
using namespace __gnu_pbds;
template<typename T>
using indexed_set [[maybe_unused]] = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define ll long long
#define pb push_back
#define SZ(v) ((int)((v).size()))
#define UNIQUE(v) sort(all(v));v.erase(unique(all(v)),v.end());
const int N = 59;
int a[N];
void run () {
    int n, k;
    cin >> n >> k;
    for (int i = 1; i <= n; ++i)
        cin >> a[i];
    int cnt = 0;
    for (int i = 1; i <= n; ++i) {
        if (a[i] >= a[k] && a[i] > 0)
            cnt++;
    }
    cout << cnt << '\n';
}
int main () {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
//    freopen("/home/hamoudi/clion/hello.in", "rt", stdin);
    int tt;
    tt = 1;
//    cin >> tt;
    while (tt--)
        run();
}
/*

 */