year = 2016
if year % 400 == 0:
print(year, " is a leap year")
else:
if year % 100 == 0:
print(year, " is not a leap year")
else:
if year % 4 == 0:
print(year, " is a leap year")
else:
print(year, " is not a leap year")
'''
run:
2016 is a leap year
'''