#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0); 
    size_t N,K; cin>>N>>K;
    multiset<ll> ms1, ms2;
    for(size_t i=0;i<N;++i){
        ll W; cin>>W;
        if(W>0){
            if(ms1.size()<K) ms1.insert(W);
            else if(*ms1.begin()<W){
                ms2.insert(std::move(ms1.extract(ms1.begin())));
                ms1.insert(W);
            }
        } else{
            W=-W;
            if(ms1.find(W) != ms1.end()){
                ms1.extract(ms1.find(W));
                if(!ms2.empty()) ms1.insert(std::move(ms2.extract(prev(ms2.end()))));
            } else if(ms2.find(W) != ms2.end()){
                ms2.extract(ms2.find(W));
            }
        }
    }
    cout<<ms1.size()+ms2.size()<<endl;
    return 0;
}