#include <bits/stdc++.h>
using namespace std;
int main()
{
int n;
cin>>n;
int a[n];
for(int i=0;i<n;i++)
{
cin>>a[i];
}
int c=0;
for(int i=0;i<n-1;i++)
{
for(int j=n-1;j>i;j–)
{
if(a[i]>a[j])
{
swap(a[i],a[j]);
c++;
}
}
}
cout<<c;
}
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