mod = 998244353


def main():
    import sys
    input = sys.stdin.readline
    
    N = int(input())
    A = list(map(int, input().split()))
    
    B = []
    for i in range(N - 1):
        if A[i+1] > A[i]:
            B.append(1)
        else:
            B.append(0)
    ans = 0
    cnt_1 = 0
    for b in B:
        if b == 0:
            ans += cnt_1
        else:
            cnt_1 += 1
    print(ans)


if __name__ == '__main__':
    main()