#include <map> #include <set> #include <list> #include <cmath> #include <queue> #include <stack> #include <cstdio> #include <string> #include <vector> #include <complex> #include <cstdlib> #include <cstring> #include <numeric> #include <sstream> #include <iostream> #include <algorithm> #include <functional> #define mp make_pair #define pb push_back #define all(x) (x).begin(),(x).end() #define rep(i,n) for(int i=0;i<(n);i++) using namespace std; typedef long long ll; typedef unsigned long long ull; typedef vector<bool> vb; typedef vector<int> vi; typedef vector<vb> vvb; typedef vector<vi> vvi; typedef pair<int,int> pii; const int INF=1<<29; const double EPS=1e-9; const int dx[]={1,0,-1,0},dy[]={0,-1,0,1}; int main(int argc, char const *argv[]) { int N; cin >> N; map<int,int> m; for (int i = 0; i < N; ++i) { int temp; cin >> temp; m[temp]++; } int ans = 0; auto it = m.begin(); while(it != m.end()) { if ((*it).second == 1) { ans++; } it++; } cout << ans << endl; return 0; }