#include<bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using mint=modint998244353; //1000000007;
using ll=long long;
using pp=pair<int,int>;
#define sr string 
#define vc vector
#define fi first
#define se second
#define rep(i,n) for(int i=0;i<(int)n;i++)
#define pb push_back
#define all(v) v.begin(),v.end()
#define pque priority_queue
#define bpc(a) __builtin_popcount(a)
ll op(ll a,ll b){return gcd(a,b);}
ll e(){return 0ll;}
int main(){
  int n;cin>>n;
  segtree<ll,op,e>sg(n);
  rep(i,n){
    ll a;cin>>a;
    sg.set(i,a);
  }
  ll ans=0;
  auto f=[&](ll a){return a!=1;};
  rep(i,n)ans+=n-sg.max_right(i,f);
  cout<<ans;
}