#include <bits/stdc++.h>
using namespace std;
#define int              long long int
#define double           long double
#define print(a)         for(auto x : a) cout << x << " "; cout << endl


const int M = 1000000007;
const int N = 3e5+9;
const int INF = 2e9+1;
const int LINF = 2000000000000000001;

inline int power(int a, int b, int mod=M) {
    int x = 1;
    a %= mod;
    while (b) {
        if (b & 1) x = (x * a) % mod; 
        a = (a * a) % mod;
        b >>= 1;
    }
    return x;
}


//_ ***************************** START Below *******************************

// 5
// 4 5 5 2 4


vector<int> a;

int consistency(int n) {
	
	map<int,int> mp;
	for(int i=0; i<n; i++){
		mp[a[i]]++;
	}
	
	int ans = 0;
	int ct = 0;
	for(auto& t : mp){
		ans += t.second * ct;
		ct++;
	}

    return ans;

}























int practice(int n){


}





void solve() {
    
    int n;
    cin >> n;
    a.resize(n);
    for(int i=0; i<n; i++) cin >> a[i];

    cout << consistency(n) << endl ;
    
    // cout << practice(n) << endl;

}








int32_t main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    int t = 1;
    // cin >> t;
    while (t--) {
        solve();
    }

    return 0;
}