#include <iostream>
#include <algorithm>
using namespace std;

int main(){
    int n;
    cin >> n;

    int a[n];
    for(int i = 0; i < n; i++)
        cin >> a[i];
    
    sort(a,a+n);

    int ans = n;
    for(int i = 0; i < n; i++)
        if(a[i] == a[i+1]) ans--;

    if(a[0] == a[n-1]) ans--;

    cout << ans << endl; 

    return 0;
}