#include <iostream>
#include <iomanip>

#include <algorithm>
#include <math.h>

#include <string>
#include <list>
/////////
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define P(p) cout<<(p)<<endl;
/////////
typedef long long LL;
typedef long double LD;
/////////
using namespace::std;
/////////

int main(void){
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed;//
    //cout << setprecision(6);//

    int N;
	cin>>N;//[1,10^5]
	int A[(int)1e5];
	rep(i,N){
		cin>>A[i];
	}
	sort(A,A+N);
	///////
	int count = 0;
	int ter = -1;
	int ans = -1;
	rep(i,N){
		if(ter != A[i]){
			ter = A[i];
			if(count == 0){
				++ans;
			}
			count = 0;
		}else{
			++count;
		}
	}
	if(count == 0){
		++ans;
	}
	P(ans);

    return 0;
}