#include <bits/stdc++.h>
using namespace std;
#define int long long
#define all(a) (a).begin(),(a).end()
#define rep(i, n) for(int i = 0; i < (n); i++)
signed main(){
int n;
cin >> n;
vector<int> a(n);
for (int i = 0; i < n; i++){
cin >> a[i];
}
map<int, int> mp;
int ans = 0;
for (int i = 0; i < n; i++) {
if(mp[a[i]] == 0) {
mp[a[i]]--;
ans++;
mp[a[i]-1]++;
// cout << "NEMEGDLEE" << endl;
}
else {
mp[a[i]-1]++;
}
}
cout << ans;
return 0;
}
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