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#include<cstdio>
#include<algorithm>
#include<utility>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<cmath>
#include<iostream>

// macros

#define FORE(c, a, b) for(int c=a; c<= int(b); ++c)
#define FORD(c, a, b) for(int c=a; c>= int(b); --c)
#define FORIT(it, cont, cont_t) for(cont_t::iterator it = cont.begin(); it != cont.end(); ++it)
#define REP(i, n) for(int i = 0; i < (n); ++i)
#define ALL(a) a.begin(), a.end() 
#define PR(n) printf("%d ", (int) (n)) 
#define PRL(n) printf("%lld ", (ll) (n)) 

#define xx first
#define yy second
#define pb push_back
#define mp make_pair
#define itr iterator

#define dbg if(0)
#define prd dbg printf

using namespace std;

typedef long long ll;
typedef long double ld;
typedef unsigned int uint;

typedef vector<int> vi;
typedef set<int> si;
typedef map<int, int> mi;
typedef pair<int, int> pi;
typedef vector<pi> vii;
typedef vector<vi> vvi;

// actual code

#define NMAX 500005

int n, x, t[NMAX];

int main() { 
  scanf("%d", &n);
  REP(i, n) {
    scanf("%d", &x);
    t[x]++;
  } 
  n++;
  sort(t, t+n);
  reverse(t, t+n);
  dbg { REP(i, n)
    PR(t[i]);
    printf("\n");
  }

  int start = 0, stop = n - 1, ans = 0;
  while(start <= stop) {
    int lider = t[start] - 1;
    ans++;
    
    while(t[stop]==0)
      stop--;

    while((start < stop) && lider > 0) {
      int change = min(lider, t[stop]);
      lider -= change;
      t[stop] -= change;
      if (t[stop] == 0)
        stop--;
    }
    start++;
  }
  PR(ans);
  return 0;
}