#include <bits/stdc++.h>
using namespace std;
#define int long long
#define endl '\n'
const int maxn=1e5+10;
const int mod=1e9+7;
multiset<int>s;
signed main()
{
ios::sync_with_stdio(false);
///freopen("dulciuri.in","r",stdin);
///freopen("dulciuri.out","w",stdout);
int n;
cin>>n;
int a[n];
int ans=0;
for(int i=0;i<n;i++)
{
cin>>a[i];
if(s.count(a[i]+1)==0)
{
ans++;
s.insert(a[i]);
}
else
{
s.erase(*s.find(a[i]+1));
s.insert(a[i]);
}
}
cout<<ans<<endl;
return 0;
}
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