#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  int N;
  cin>>N;
  vector<int> S(N);
  for(int i=0;i<N;i++) cin>>S[i];
  int ans = 0;
  int now = 0;
  for(int i=0;i<N-1;i++){
      if(S[i] < S[i+1]) now++;
      else ans += now;
  }
  cout<<ans<<endl;
}