import sys
input = lambda : sys.stdin.readline().rstrip()

sys.setrecursionlimit(2*10**5+10)
write = lambda x: sys.stdout.write(x+"\n")
debug = lambda x: sys.stderr.write(x+"\n")
writef = lambda x: print("{:.12f}".format(x))


n = int(input())
a = list(map(int, input().split()))
ans = 0
l = []
for v in a:
    for u in l:
        if u>v:
            ans += 1
    l.append(v)
print(ans)