Files
code_olymp/uts/session_py/dist_march_2k17/Peter.py

27 lines
452 B
Python

import sys
sys.stdin = open("input.txt", "r")
sys.stdout = open("output.txt", "w")
s = int(input())
l = 1
h = int(10e18)
while l <= h:
mid = (l+h)//2
x = mid
now = mid
while x != 0:
st = str(x)
st = st[:-1]
if len(st) == 0:
break
x = int(st)
now += x
if now == s :
print(mid)
quit()
elif now < s :
l = mid + 1
else :
h = mid - 1
print(-1)