x = 10
if x in range(1,13):
if x==1:
print('January 31')
elif x==2:
print('February 28')
elif x==3:
print('March 31')
elif x==4:
print('April 30')
elif x==5:
print('May 31')
elif x==6:
print('June 30')
elif x==7:
print('July 31')
elif x==8:
print('August 31')
elif x==9:
print('September 30')
elif x==10:
print('October 31')
elif x==11:
print('November 30')
else:
print('December 31')