n = int(input()) #print(n)

def fun(num): sum = 0 for i in range(1,num+1): if num%i ==0: sum+=i
if sum == 2*num: return 1 # 返回什么不重要，计算方便就好 else: return 0 #print(type(fun(n))) #<class 'int'> 返回是一直接计算和就行了 out_sum = 0 for i in range(1,n+1): out_sum+=fun(i) print(out_sum)