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