#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ld double
#define FOR(L , R) for(int i = L;i <= R;i++)
const int INF = 1e18;
const int sz = 2e5 + 5;
const int usz = 1e6 + 5;
const int mod = 998244353;
signed main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
int ans = 0;
int n , q;
cin >> n >> q;
map < int , int > cnt;
while(q--)
{
int x;
cin >> x;
cnt[x]++;
}
cout << max(0LL , cnt[1] - cnt[-1] - 1) << endl;
}
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