#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
long long count_swaps(std::vector<int> s) {
  if(s.size()/2 == 1){
    if(s[0]<s[1]){
      return 0;
    }
    else{
      return 1;
    }
  }
	return ((s.size()/2)*((s.size()/2)-1))/2;
}
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