#include<bits/stdc++.h> using namespace std; void place_l(vector < int > &ord, int x){ vector < int > cur; for(int i : ord){ if(i == x)continue; if(i == 0)cur.push_back(x); cur.push_back(i); } ord = cur; } void place_r(vector < int > &ord, int x){ vector < int > cur; for(int i : ord){ if(i == x)continue; cur.push_back(i); if(i == 0)cur.push_back(x); } ord = cur; } int get(vector < int > ord, int x){ for(int i = 0; i < ord.size(); i++){ if(ord[i] == x) return i; } return 1e9; } int main(){ int n, q, cnt = 0; cin >> n >> q; map < int , bool > is; for(int _ = 0; _ < q; _++){ int x; cin >> x; if(is[abs(x)] == true){ cnt++; is.clear(); } is[abs(x)] = 1; } cout << cnt << "\n"; }