#include "bits/stdc++.h"
using namespace std;
#define fi first
#define se second
#define mp make_pair
#define pii pair<int,int>
#define yes cout<<"YES\n"
#define no cout<<"NO\n"
#define pb push_back
#define sz(x) (int)(x).size()
#define rsz resize
#define ass assign
#define F(i,l,r) for(int i=(l);i<(r);++i)
typedef long long ll;
typedef unsigned long long ull;
typedef long double lld;
//template<typename T> using pqg = priority_queue<T, vector<T>, greater<T>>;
#define each(a,x) for(auto a:x)
#define FOR(i,a) for(int i=0;i<(a);i++)
#define ROF(i,a,b) for(int i=(b)-1;i>=(a);i--)
#define eb emplace_back
#define ft front()
#define V vector
#include "shoes.h"
ll count_swaps(V<int> s){
int n=sz(s);
ll res=0;
for(int i=0;i<n;i+=2){
int id=-1;
F(j,i+1,n){
if(-s[j]==s[i]){
id=j;
break;
}
}
while(id!=i+1){
res++;
swap(s[id],s[id-1]);
id--;
}
if(s[i]>0){
res++;
swap(s[i],s[i+1]);
}
}
return res;
}
