#include<bits/stdc++.h>using namespace std;long n,i,j,t,s,a[10000] ;intmain(){ cin >> n; for(i=1;i<=n;++i){// a1->a10 cin >> a[i]; } //冒泡排序,n:10 s=0; for(i=1;i<n;++i) {// 1迭代到9 for(j=1;j<=n-i;j++) {// 1迭代到9 if(a[j]>a[j+1]){ swap(a[j],a[j+1]); s++; } } } cout << s; return 0;}