#include <iostream>
#include <vector>
#include <algorithm>
#include <queue>
#include <set>
#include <map>
#define INF 1e9
typedef long long ll;
using namespace std;
void solve()
{
int n; cin >> n;
vector<int>v(n);
for (int i = 0; i < n; i++)cin >> v[i];
int ans = 0;
map<int, int>visited;
for (int i = 0; i < n; i++) {
if (!visited[v[i] + 1])++ans;
else visited[v[i] + 1] = 0;
visited[v[i]]++;
}
cout << ans << "\n";
}
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
int t = 1;// cin >> t;
while (t--) solve();
return 0;
}
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