#include<bits/stdc++.h>
#define rep(i, n) for(int i = 0; i < n; i++)

using namespace std;
using ll = long long;


int main(){
  int N;
  cin >> N;
  set<int> S;
  rep(i, N){
    int s;
    S.incert(s);
  }
  
  int ans = 0;
  rep(i, S.size()){
    ans += S[i]-1;
  }
  cout << ans << end;
}
   
      
    