#include <bits/stdc++.h>
using namespace std;

#define rep(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define ALL(v) (v).begin(),(v).end()
using ll=long long int;
const int inf = 0x3fffffff; const ll INF = 0x1fffffffffffffff; const double eps=1e-12;
template<typename T>inline bool chmax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
template<typename T>inline bool chmin(T& a,T b){if(a>b){a=b;return 1;}return 0;}



int main(){
   int n;
   cin>>n;
   vector<int> a(n);
   rep(i,0,n)cin>>a[i];

   int res=n*(n+1)/2;
   rep(i,0,n)if(a[i]==n)res-=(i+1)*2;
   cout<<res<<'\n';
   return 0;
}