백준_BruteForce_분해합

n = input()
n = int(n)

def getsSum(num):
    sSum = num
    while(num >= 1):
        sSum += (num % 10)
        num = num // 10
    return sSum


flag = False
for i in range(n):
    if getsSum(i) == n:
        print(i)
        flag = True
        break
if flag == False:
    print(0)