题解 | #完全数计算#

def f(x):
    ls = []
    if x == 0:
        return True
    else:
    
        for i in range(1,x+1):
            if x%i == 0:
                ls.append(i)
        del ls[-1]
        if sum(ls) == x:
            return True
    return False


n = int(input())
c = 0
for i in range(1,n+1):
    if f(i):
         c += 1
print(c)