#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
#define sig signed
#define int long long
#define arr array
#define vec vector
const int N = 2e5 + 5;
int n;
arr<int, 2 * N> a;
int slv(vec<int> x) {
if (x.empty()) return 0;
int tr = -x[0], ans = (x[0] < 0) ? 0 : 1;
x.erase(x.begin());
for (int i = 0; i < x.size(); i++) {
if (x[i] != tr) continue;
ans += i;
x.erase(x.begin() + i);
break;
}
return ans + slv(x);
}
// SIZE OF A IS 2 * N
int count_swaps(vec<sig> _a) {
n = _a.size() / 2;
for (int i = 1; i <= 2 * n; i++) a[i] = _a[i - 1];
vec<int> x;
for (int i = 1; i <= 2 * n; i++) x.push_back(a[i]);
int ans = slv(x);
return ans;
}
