#include<iostream> using namespace std; int main() { int n,i,j,k,b,min=0; cin>>n; int a[n+1]; for(i=1;i<=n;i++) cin>>a[i]; for(j=1;j<=n-1;j++) for(k=1;k<=n-j;k++) if(a[k]>a[k+1]) {swap(a[k],a[k+1]); min++;} cout<<min; return 0; }