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#include <bits/stdc++.h>
using namespace std;


int main(){
    ios_base::sync_with_stdio(0);
    int n;
    cin>>n;
    vector<int> occ(n+1);
    for(int i=0;i<n;i++){
        int a;
        cin>>a;
        occ[a]++;
    }

    sort(occ.begin(), occ.end());

    int small = 0;
    int res = 0;
    for(int i=n;i>=0;i--){
        if(occ[i] == 0) continue;
        res++;
        int sum = 0;
        while(small < i && sum+occ[small] < occ[i]){
            sum += occ[small];
            occ[small] = 0;
            small++;
        }
        if(small < i){
            int cnt = occ[i]-sum-1;
            occ[small] -= cnt;
        }
        occ[i] = 0;
    }

    cout<<res<<endl;
}