n=int(input())
t=[int(input()) for i in range(n)] 
s=[(i,t.index(i)+1) for i in range(1,n+1)] 
c=0
d=0
for i in range(0,n):
        for t in range(0,n):
            if s[i][0]==s[t][1] and s[i][1]==s[t][0]:
                d+=1
for i in range(0,n):
    if s[i][0]<=s[i][1]:
        for p in range(0,i):
            if s[p][0]<=s[p][1]:
                if s[i][0]<=s[p][0]<=s[p][1]<=s[i][1]:
                    c+=1
            elif s[i][0]<=s[p][1]<=s[p][0]<=s[i][1]or s[i][0]<s[p][1]<s[i][1]<s[p][0]:
                    c+=1
        for p in range(i+1,n):
            if s[p][0]<=s[p][1]:
                if s[i][0]<=s[p][0]<=s[p][1]<=s[i][1]:
                    c+=1
            elif s[i][0]<=s[p][1]<=s[p][0]<=s[i][1]or s[i][0]<s[p][1]<s[i][1]<s[p][0]:
                c+=1
    else:
        for p in range(0,i):
            if s[p][0]<=s[p][1]:
                if s[i][1]<=s[p][0]<=s[p][1]<=s[i][0]or s[i][1]<s[p][0]<s[i][0]<s[p][1]:
                    c+=1
            elif s[i][1]<=s[p][1]<=s[p][0]<=s[i][0]:
                c+=1
        for p in range(i+1,n):
            if s[p][0]<=s[p][1]:
                if s[i][1]<=s[p][0]<=s[p][1]<=s[i][0] or s[i][1]<s[p][0]<s[i][0]<s[p][1]:
                    c+=1
            elif s[i][1]<=s[p][1]<=s[p][0]<=s[i][0]:
                c+=1
print(int(c-d/2))