# include <bits/stdc++.h>
# define ll long long
# define speed ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
using namespace std;
const int MAX_N = 100007;
ll count_swaps( vector < int > s ) {
speed;
ll n = s.size(), sz = 0;
ll ans = 0;
vector < int > ids, used(n);
vector < queue < int > > vc(2 * MAX_N);
for ( int i = 0; i < n; i++ ) {
s[i] += MAX_N;
vc[s[i]].push( i );
}
// cout << "Done 1" << endl;
for ( int i = 0; i < n; i++ ) {
if ( used[i] ) {
continue;
}
s[i] -= MAX_N;
int l = i, r = vc[-s[i] + MAX_N].front();
// cout << "Done 2 " << l << ' ' << r << endl;
vc[ s[i] + MAX_N ].pop();
int rr = r;
used[r] = 1;
vc[-s[i] + MAX_N].pop();
int x = upper_bound( ids.begin(), ids.end(), i ) - ids.begin();
x = sz - x;
l += x;
x = upper_bound( ids.begin(), ids.end(), r ) - ids.begin();
x = sz - x;
r += x;
ans += r - l - 1;
if ( s[i] > 0 ) {
ans++;
}
sz++;
ids.push_back( rr );
}
return ans;
}
/*
int main() {
ll n;
cin >> n;
vector < int > S(2 * n);
for ( ll i = 0; i < 2 * n; i++ ) {
cin >> S[i];
}
cout << count_swaps( S );
}
*/
