#include <iostream>
using namespace std;
int n;
bool check(int *arr) {
for(int u=1; u<n; u++) {
if (arr[u]<arr[u-1]) return 0;
}
return 1;
}
int main() {
cin >> n;
int arr[n];
for(int i=0; i<n; i++) cin >> arr[i];
int counter=0;
while(!check(arr)) {
int pos = 1;
for(int j=pos; j<n; j++) {
if(arr[j]<arr[j-1]) {
int prev;
prev = arr[j-1];
arr[j-1] = arr[j];
arr[j] = prev;
pos = j;
counter++;
}
}
}
cout << counter;
return 0;
}
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