n=1000
ls1 = [] #用来存放完美数
ls2 = [] #用来存放约数
for i in range(1,n):
    for j in range(1,i):
        if i % j ==0:
            ls2.append(j)
    if sum(ls2) == i: #判断约数之和是否与该数相等
        ls1.append(i)
    ls2 = []
print(len(ls1))