685 B | 685 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from decimal import Decimal
BLANK = " "
inp = input
# inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def f(n):
return sum([*map(int, list(str(n)))])
def solve():
while 1:
n = ii()
n2 = f(n)
if n == 0:
break
for p in range(11, 1000):
k = f(n * p)
if n2 == k:
print(p)
break
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()