year = int(input(enter the year))
if( year % 4) == 0:
if(year % 100) == 0:
if(year % 400) == 0:
print("{0} is a leap year " . format(year))
else:
print(" {0} is not a leap year".format(year))
else:
print("{0} is a leap year ".format (year))
else:
print({0} is not leap year.format (year) )
