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- #include <bits/stdc++.h>
- using namespace std ;
- #define sz(s) int(s.size())
- typedef long long ll ;
- #define all(v) v.begin() , v.end()
- void ABDEL3AL () {
- ios_base::sync_with_stdio(false); cin.tie(nullptr) , cout.tie(nullptr) ;
- #ifndef ONLINE_JUDGE
- freopen("input.txt" , "r" , stdin) , freopen("output.txt" , "w" , stdout) ;
- #endif
- }
- int main() {
- ABDEL3AL() ;
- int n , cnt = 0 ;
- cin >> n ;
- map <ll , int> mp ;
- while (n--) {
- ll x ; cin >> x ;
- mp[x]++ ;
- }
- for (int& i : mp)
- if (i.second == 1) cnt++ ;
- cout << cnt ;
- return 0;
- }
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