666 B | 666 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 solve():
while 1:
a, b = mfi()
if a == b == 0:
break
for X in range(50, 100000, 50):
if a * a + b * b <= X * 2 / pi:
p(f"The property will be flooded in hour {int(X // 50)}.")
break
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()