#include "bits/stdc++.h"
#include <random>
#include <algorithm>
#include <unordered_set>
#define rep(i,n) for(int i = 0; i < n; i++)
typedef long long ll;
typedef unsigned long long ull;
using namespace std;
#define vll vector<vector<long long>>
#define vl vector<long long>
#define vi vector<int>
#define vii vector<vector<int>>
#define pb push_back
#define pf push_front
#define ld long double
#define Sort(a) sort(a.begin(),a.end())
#define cSort(a,cmp) sort(a.begin(),a.end(),cmp)
#define reSort(a) sort(a.rbegin(), a.rend())
static const ll llMAX = numeric_limits<long long>::max();
static const int intMAX = numeric_limits<int>::max();
static const ll  llMIN = numeric_limits<long long>::min();
static const int intMIN = numeric_limits<int>::min();
static const ll d_5 = 100000;
static const ll d9_7 = 1000000007;
static const ll d_9 = 1000000000;
static const double PI=3.14159265358979323846;

template<class T>
void Printvector(std::vector<T> a){
  int size = a.size();
  rep(i,size){
    cout<<a[i]<<" ";
  }
  cout<<endl;
}
template<class T>
void Printvector(std::vector<std::vector<T>> a){
  int size = a.size();
  rep(i,size){
    int size2=a[i].size();
    rep(j,size2){
      cout<<a[i][j]<<" ";
    }
    cout<<endl;
  }
  cout<<endl;
}
template<class T>
vector<T> getaccum(vector<T> a){
  int size=a.size();
  vector<T> ans(size);
  ans[0]=a[0];
  for(int i=0;i<size-1;i++){
    ans[i+1]=ans[i]+a[i+1];
    //ans[i+1]%=d9_7;
  }
  return ans;
}
template<class T>
vector<vector<T>> getaccum2D(vector<vector<T>> a){
  int sizey=a.size();
  int sizex=a[0].size();
  vector<vector<T>> ans(sizey,vector<T>(sizex,0));
  //ans=a;
  ans[0][0]=a[0][0];
  for(int i=1;i<sizex;i++){
    ans[0][i]=ans[0][i-1]+a[0][i];
  }
  for(int i=1;i<sizex;i++){
    ans[i][0]=ans[i-1][0]+a[i][0];
  }
  for (int i = 0; i < sizey-1; i++)
        for (int j = 0; j < sizex-1; j++)
            ans[i+1][j+1] = ans[i][j+1] + ans[i+1][j] - ans[i][j] + a[i+1][j+1];
  return ans;
}
ll getaccumnum(vector<ll> accum,int l,int r){//閉区間[l,r]の総和
  if(l==0){
    return accum[r];
  }else{
    return accum[r]-accum[l-1];
  }
}
template<class T>
T getaccumnum2D(vector<vector<T>>& accum,int x1,int y1,int x2,int y2){//2の方が右下、閉区間
  
  T ans=accum[y2][x2];
  if(x1==0 && y1==0){
    ;
  }else if(x1>0 && y1==0){
    ans-=accum[y2][x1-1];
  }else if(x1==0 && y1>0){
    ans-=accum[y1-1][x2];
  }else{
    ans-=accum[y1-1][x2];
    ans-=accum[y2][x1-1];
    ans+=accum[y1-1][x1-1];
  }
  return ans;
}
ll digitpower(ll a,ll b){//aのb乗を計算
  if(b==1){
    return a;
  }else if(b==0){
    return 1;
  }
  int mode=0;
  if(b%2==1){
    ll tmp = digitpower(a,(b-1)/2);
    if(mode==1){
      tmp%=d9_7;
    }
    tmp*=tmp;
    if(mode==1){
      tmp%=d9_7;
    }
    tmp*=a;
    if(mode==1){
      return tmp%d9_7;
    }else{
      return tmp;
    }
  }else{
    ll tmp = digitpower(a,(b)/2);
    if(mode==1){
      tmp%=d9_7;
    }
    tmp*=tmp;
    if(mode==1){
      tmp%=d9_7;
    }
    if(mode==1){
      return tmp%d9_7;
    }else{
      return tmp;
    }
  }
}

vl facs(2000010,-1);
ll Factrial(ll num){
  if(facs[num]!=-1){
    return facs[num];
  }
  if(num==1||num<=0){
    return 1;
  }else if(num<0){
    printf("ERROR_minus\n");
    return 0;
  }else{
    facs[num]=(num*Factrial(num-1))%d9_7;
    return facs[num];
  }
}
long long modinv(long long a, long long m) {//modの逆元

    long long b = m, u = 1, v = 0;
    while (b) {
        long long t = a / b;
        a -= t * b; swap(a, b);
        u -= t * v; swap(u, v);
    }
    u %= m; 
    if (u < 0) u += m;
    return u;
}

vl invs(2000010,-1);
ll linercomb(ll n,ll k, ll mod){//n,kの線形時間で求める
if(n<k)return 0;
if(n<0)return 0;
if(k==0 || k==n)return 1;
  ll ans=Factrial(n);
  if(invs[k]==-1){
    invs[k]=modinv(Factrial(k),mod);
  }
  ans*=invs[k];
  ans%=d9_7;
  ll k1=Factrial(n-k);
  k1%=mod;
  ans*=modinv(k1,mod);
  ans%=mod;
  return ans;
}
unordered_map<ll,ll> prime_factor(int64_t n) {
  unordered_map<ll,ll> ret;
  for(int64_t i = 2; i * i <= n; i++) {
    while(n % i == 0) {
      ret[i]++;
      n /= i;
    }
  }
  if(n != 1) ret[n] = 1;
  return ret;
}



struct datas{
  ll p;
  ll q;
};/*
bool cmp(const datas &a, const datas &b)
{
    return a.num < b.num;
}*/
template<class T>
T gcd(T a,T b){
  if(a==0){
    return b;

  }else if(b==0){
    return a;
  }
  while(1) {
    if(a < b) swap(a, b);
    if(!b) break;
    a %= b;
  }
  return a;
}
int LCS(string s,string t) {
  int n=s.size();
  int m=t.size();
  vector<vector<int>> dp=vector<vector<int>>(n+1,vector<int>(m+1,0));
    for (int i=0; i<n; ++i) {
        for (int j=0; j<m; ++j) {
            if (s[i] == t[j]) {
                dp[i+1][j+1] = dp[i][j] + 1;
            }
            else {
                dp[i+1][j+1] = max(dp[i][j+1], dp[i+1][j]);
            }
        }
    }
    return dp[n][m];
}
//素数列挙
#define P 100000
vl primes;
vl primenum(P+1);
vector<bool> bprime(P+200);
ll searchprime(ll max){//発見した素因数の個数を返す
//max+=180;
  bprime[1]=false;
 // cout<<"rrr"<<endl;;
  //cout<<max<<" "<<bprime.size()<<endl;
  for(ll i=2;i<=max;i++){
    bprime[i]=true;
  }
 //// cout<<"r";
  ll nowprimes=1;
  primes.pb(2);
  for(ll i=4;i<max;i+=2){
    bprime[i]=false;
  }
  //  cout<<"e";

  for(ll i=3;i<=max;i+=2){
    if(bprime[i]==true){
      //primes[nowprimes]=i;
      primes.pb(i);
      nowprimes++;
      for(ll j=2;i*j<=max;j++){
        bprime[i*j]=false;
      }
    }
  }
  return nowprimes;
}
class Inversion_number{
  //Segment Tree
  private:
    int n=-1;
    bool calced=false;
    vector<int> vec;
    vector<int> locs;
    vector<int> invnum;
    class SegmentTree{
      public:
      int n;
      vector<int> nodes;
        //constructor
        SegmentTree(int size,int init){
          initialize(size,init);
        }
        SegmentTree(){
          ;
        }
        //関数を定義(minなのかmaxなのかとか)
        int thisoperator(int a, int b){
          return a+b;
        }
        void update(int x,int a){//xがindex
          x+=n-1;
          nodes[x]+=a;
          while(x>0){
            x=(x-1)/2;
            nodes[x]=thisoperator(nodes[2*x+1],nodes[2*x+2]);
          }
        }
      void initialize(int inputn,int init){
          int k=0;
          while(inputn>(1<<k)){
            k++;
          }
          n=(1<<k);
          nodes=vector<int> ((1<<k)*2-1,init);
      }
      int sec_get(int reql,int reqr,int nowindex=0,int nowl=0,int nowr=-1){
        // 最初に呼び出されたときの対象区間は [0, n)
        //reqrは開区間であることに注意
        if(nowr < 0) nowr = n;

        // 要求区間と対象区間が交わらない -> 適当に返す
        if(nowr <= reql || reqr <= nowl) return 0;

        // 要求区間が対象区間を完全に被覆 -> 対象区間を答えの計算に使う
        if(reql <= nowl && nowr <= reqr) return nodes[nowindex];
        // 要求区間が対象区間の一部を被覆 -> 子について探索を行う
        // 左側の子を vl ・ 右側の子を vr としている
        // 新しい対象区間は、現在の対象区間を半分に割ったもの
        int val1 = sec_get(reql, reqr, 2*nowindex+1, nowl, (nowl+nowr)/2);
        int val2 = sec_get(reql, reqr, 2*nowindex+2, (nowl+nowr)/2, nowr);
        return thisoperator(val1, val2);
      }
      void Printn(){
        cout<<"Printvector"<<endl;
        rep(i,n){
          cout<<nodes[i+n-1]<<" ";
        }
        cout<<endl;
      }
    };
    SegmentTree seg;

  public:
  Inversion_number(vector<int> invec){//constructor
    vec=invec;
    n=invec.size();
    seg.initialize(n,0);
    invnum=vector<int>(n,0);
    locs=vector<int>(n,-1);
    for(int i=0;i<n;i++){
      locs[vec[i]]=i;
    }
  }
  void calc(){
    if(n==-1){
      cout<<"unconstructed"<<endl;
      return;
    }
    for(int i=0;i<n;i++){
      int num=seg.sec_get(0,vec[i]+1);
      invnum[i]=i-num;
      seg.update(vec[i],1);
    }
    calced=true;
  }
  int getinvnum(int index){
    if(!calced){
      cout<<"not calced"<<endl;
      return -1;
    }
    return invnum[index];
  }
};

int main(void){
  ll n;
  cin>>n;
  vi m(n);
  rep(i,n){cin>>m[i];m[i]--;}
  Inversion_number inv(m);
  inv.calc();
  int ans=0;
  rep(i,n){
    ans+=inv.getinvnum(i);
  }
  cout<<ans<<endl;
  return 0;
}

//<<std::setprecision(30)

//重複削除
 /* std::sort(vec.begin(), vec.end());
  vec.erase(std::unique(vec.begin(), vec.end()), vec.end());*/