def poisonousPlants(p):
    vet = [float('inf')]*len(p)
    ind = [-1]*len(p)
    aux = 0
    dias = 0
    for i in range(1, len(p)):
        j = i - 1
        Achou = False
        aux = 0
        while not Achou:
            if p[j] >= p[i]:
                if vet[j] == float('inf'):
                    Achou = True
                else:
                    aux = vet[j]
                    j = ind[j]
            else:
                if vet[j] > aux:
                    vet[i] = aux + 1
                    dias = max(dias, vet[i])
                    ind[i] = j
                    Achou = True
                else:
                    j = ind[j]
    return dias