# If function

# If you want to make a good program flow, you have to use the 'If function'
# If function is same if grammer in english.

# I'll make a ealier program to use the If function.
# If someone wirte the number, the number will divide by three.
# But someone wirte a '0' numver, this program will stop and push the error message.

print('Write the number : ')
a = int(input())

if a == 0 :
    print('0 can not use the number')
else :
    print ('3 /', a, '=', 3/a)

# Also you can use the 'else if' after 'if function'.

Print('Write the day(Monday to sunday) : ')
day = input()

if day == 'Monday' :
    print('MON')
elif day == 'Tuesday' :
    print('TUE')
elif day == 'Wednesday' :
    print('WED')
elif day == 'Thursday' :
    print('THU')
elif day == 'Friday' :
    print('FRI')
elif day == 'Saturday' :
    print('SAT')
elif day == 'Sunday' :
    print('SUN')
else :
    print('It is wrong day')

    
