#include <bits/stdc++.h> using namespace std; signed main(){ ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); int n, q; cin >> n >> q; vector < int > v; while(q--){ int x; cin >> x; v.push_back(x); } int ans = 0, cnt = 0; for(int i = 0; i < v.size() - 1; i++){ if(v[i] == v[i + 1]) cnt++; else { ans += cnt; cnt = 0; } } ans += cnt; cout << ans << endl; }