#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
long long int count_swaps(vector<int>v){
return ((v.size()/2)*(v.size()/2-1))/2;
}
/*int main(){
int n;
cin>>n;
vector<int>v(2*n);
for(int k=0;k<2*n;k++){
cin>>v[k];
}
cout<<count_swaps(v);
}*/
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