#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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