#include<bits/stdc++.h>
#define i64 long long
#define mx(a,b,c) max(a,max(b,c))
#define mn(a,b,c) min(a,min(b,c))
#define eef else if
#define ff(i,s,e) for(int i=(s); i<e; i++)
#define ff2(i,s,e) for(int i=(s); i>=e; i--)
#define sf scanf
#define pf printf
#define dbug(x) cout<<"x = "<<x<<endl
#define newl cout<<"\n"
#define putcase cout<<"Case "<<++cse<<":"
using namespace std;
int main()
{
int sum=0 , n, k;
while(cin>>n>>k){
vector<int>v;
ff(i,0,n){
int x;
cin>>x;
v.push_back(x);
}
int limit=v[k-1];
ff(i,0,n){
if(v[i]>0 && v[i]>=limit){
sum++;
// dbug(v[i]);
}
}
cout<<sum<<endl;
sum=0;
}
return 0;
}
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