#include<stdio.h>
char  a[100],aux;
long n,i,j,ok,k;
int main()
{
freopen("litere.in","r",stdin);
freopen("litere.out","w",stdout);

scanf("%ld",&n);

for (i=1;i<=n;i++)

	     scanf("%ld",&a[i]);


do{
   ok=1;

   for(i=1;i<n;i++)
       if(a[i]>a[i+1]) {
		 aux=a[i];
		 a[i]=a[j];
		 a[j]=aux;
		 ok=0;
		 k++;
		}
   }while(ok);

printf("%d",k);
return 0;
}