#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n, q;
cin >> n >> q;
int a=0;
int b=0;
for (int i=0;i<q;i++) {
int x;
cin >> x;
if (b==0) {
b=x;
continue;
}
if (x==b) {
a++;
}
else {
a++;
b=x;
}
}
cout << a << "\n";
}
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