#include <stdio.h>
 
void main(){
    int n,c = 0;
    scanf("%d",&n);
    int a[n];
    //读入元素
    int i,j;
    for(i = 0;i < n;i++){
        scanf("%d",&a[i]);
    } 
     
    //从每个数后面找比这个数小的数 
    for(i = 0;i < n - 1;i++){
        //循环a[i]后面的数 
        for(j = i + 1;j < n;j++){
            if(a[j] < a[i]){
                c++;
            } 
        }
    }
     
    printf("%d\n",c);
}
/**************************************************************
	Problem: 1215
	User: admin
	Language: C
	Result: Accepted
	Time:8 ms
	Memory:1144 kb
****************************************************************/