#include "bits/stdc++.h"
using namespace std;
//#define int long long
#define all(x) (x).begin(),(x).end()
#define sz(x) (int)x.size()
struct Fenwick{
vector<int64_t> fw;
int N;
Fenwick(int64_t _n){
N = _n + 15;
fw.assign(N,0);
}
void upd(int64_t c){
for(;c<N;c+=c&-c) fw[c]--;
}
int64_t query(int64_t c,int64_t res=0){
for(;c;c-=c&-c) res+=fw[c];
return res;
}
};
int64_t count_swaps(vector<int> S){
int64_t n , ans = 0;
n = sz(S) / 2;
int64_t ar[2 * n + 5];
for(int i=1;i<=2*n;i++) ar[i] = S[i - 1];
queue<int64_t> q;
vector<int64_t> pos[n+5];
Fenwick F(2*n);
for(int i=1;i<=2*n;i++){
if(ar[i]<0) q.push(i);
else pos[ar[i]].push_back(i);
}
for(int i=1;i<=n;i++) reverse(all(pos[i]));
while(!q.empty()){
int64_t c = q.front();
q.pop();
int64_t x = pos[-ar[c]].back();
pos[-ar[c]].pop_back();
F.upd(c + 1);
ans += c + F.query(c) - 1;
F.upd(x + 1);
ans += x + F.query(x) - 1;
}
return ans;
}
/*void _(){
int n,ans=0; cin >> n;
int ar[2*n+5];
for(int i=1;i<=2*n;i++) cin >> ar[i];
queue<int> q;
vector<int> pos[n+5];
Fenwick F(2*n);
for(int i=1;i<=2*n;i++){
if(ar[i]<0) q.push(i);
else pos[ar[i]].push_back(i);
}
for(int i=1;i<=n;i++) reverse(all(pos[i]));
while(!q.empty()){
int c = q.front();
q.pop();
int x = pos[-ar[c]].back();
pos[-ar[c]].pop_back();
F.upd(c + 1);
ans += c + F.query(c) - 1;
F.upd(x + 1);
ans += x + F.query(x) - 1;
}
cout << ans << '\n';
}
int32_t main(){
ios::sync_with_stdio(0);
cin.tie(0);
int tc=1;//cin >> tc;
while(tc--) _();
}*/
