N=int(input()) che=list(input().split()) che=list(map(int,che)) ci=0 c=0 for i in range(1,N+1): for j in range(N-1,-1,-1): if che[j]==i and j+1>i: c=che[j] che[j]=che[j-1] che[j-1]=c ci+=1 c=0 print(ci)
只有三十分,全是RE