# step1_rain.py — one signal, one rule.
# Rain in Chiang Mai, in millimetres per day, for one week.
# If one day has heavy rain, we print a warning.

RAIN = [4, 0, 12, 31, 88, 64, 9]   # mm per day, Monday to Sunday
HEAVY = 50                         # 50 mm in one day is heavy rain

for day, mm in enumerate(RAIN, start=1):
    if mm >= HEAVY:
        print("day", day, "- heavy rain:", mm, "mm. Watch the river.")
    else:
        print("day", day, "- ok:", mm, "mm.")