/*
ID: Sho10
LANG: C++
*/
#include "shoes.h"
#include <bits/stdc++.h> //Andrei Alexandru a.k.a Sho10
#define ll long long int
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#define all(a) (a).begin(), (a).end()
#define sz size
#define f first
#define s second
#define pb push_back
#define er erase
#define in insert
#define mp make_pair
#define pi pair
#define rc(s) return cout<<s,0
#define endl '\n'
#define mod 1000000007
#define PI 3.14159265359
#define CODE_START ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
vector<int>v;
ll count_swaps(std::vector<int> S){
v=S;
ll ans=0;
ll n=v.size()/2;
if(n==1){
if(v[0]<0){
ans=0;
}else ans=1;
}else {
n--;
ans=n*(n+1)/2;
}
return ans;
}
