#include "bits/stdc++.h"
using namespace std;
#define ln "\n"
#define dbg(x) cout << #x << " = " << x << ln
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define inf 2e18
#define fast_cin() \
ios_base::sync_with_stdio(false); \
cin.tie(NULL)
#define out(file) freopen(file, "w", stdout)
#define in(file) freopen(file, "r", stdin)
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
#define int long long
int MOD = 1e9 + 7;
const int N = 2e5 + 7;
int n, q;
int x[N];
void sub1() {
int cnt = 0;
int cur = 0;
while(q--) {
int u; cin >> u;
if(u < 0) {
cur = 0;
} else {
if(cur == 1) cnt++;
else cur = 1;
}
}
cout << cnt;
}
void sub2() {
vector<int> cnt(q+1, 0);
for(int i = 1; i <= q; i++) {
cnt[x[i]]++;
}
int ans = 0;
for(int i = 1; i <= q; i++) {
ans = max(ans, cnt[i] - 1);
}
cout << ans;
}
signed main() {
fast_cin();
cin >> n >> q;
if(n == 2) sub1();
else {
bool ok = 1;
for(int i = 1; i <= q; i++) {
cin >> x[i];
if(x[i] < 0) ok = 0;
}
if(ok) sub2();
}
cerr << "\nTime: " << clock() * 1000 / CLOCKS_PER_SEC;
}
