#include<bits/stdc++.h> #define int long long using namespace std; namespace Fast{ inline int fr(){ register int x = 0,f = 1; static char c = getchar(); while (c < '0' || c > '9'){ if (c == '-'){ f = -1; } c = getchar(); } while (c >= '0' && c <= '9'){ x = (x << 1) + (x << 3) + (c ^ 48); c = getchar(); } return x * f; } inline void CCF(int opt){ ios::sync_with_stdio(false); if (opt == 0){ cout.tie(0); return ; } if (opt >= 1){ cin.tie(0); } if (opt >= 2){ cout.tie(0); } } } using namespace Fast; int a[114514]; signed main(){ //freopen(".in","r",stdin); //freopen(".out","w",stdout); CCF(2); int n = fr(),sum = 0; for (int i = 1;i <= n;i++){ a[i] = fr(); } for (int i = 1;i <= n;i++){ for (int j = i + 1;j <= n;j++){ if (a[i] > a[j]){ sum++; } } } cout<<sum; return 0; }