// 01001100 01001111 01010100 01000001 \\
// \\
// ╦ ╔═╗╔╦╗╔═╗ \\
// ║ ║ ║ ║ ╠═╣ \\
// ╩═╝╚═╝ ╩ ╩ ╩ \\
// \\
// 01001100 01001111 01010100 01000001 \\
#include <bits/stdc++.h>
using namespace std;
#define N 200001
#define nl '\n'
#define ff first
#define ss second
#define add insert
#define ll long long
#define ld long double
#define terminator main
#define pll pair<ll,ll>
#define append push_back
#define pii pair<int,int>
#define all(x) (x).begin(),(x).end()
#define L0TA ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
void solve(){
map<int, bool> x;
int n, m, o, p;
cin >> n >> m;
o = 0;
while(m--){
cin >> p;
if(p < 0)
x[-p] = 0;
else{
if(x[p]){
o++;
x.clear();
}
x[p] = 1;
}
}
cout << o;
}
int terminator(){
L0TA;
solve();
return 0;
}
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