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#include<stdio.h>
int ary[10000000];
long long int ans=0,n;

int main(){
	scanf("%lld",&n);
	for(int i=0;i<n;i++){
		scanf("%d",&ary[i]);
	}
	for(int j=0;j<n-1;j++){
		for(int i=0;i<n-j-1;i++){
			if(ary[i]>ary[i+1]){
				int tmp;
				tmp=ary[i+1];
				ary[i+1]=ary[i];
				ary[i]=tmp;
				ans++;
			}
		}
	}
	/*
	for(int i=0;i<n;i++){
		printf("%d ",ary[i]);
	}
	*/
	printf("%lld\n",ans);
}