tomorrow = 'Thursday'

if tomorrow == 'Thursday':
    print("Class will be held")
elif tomorrow == 'Friday':
    print("This is friday")
else:
    print("Chuti!!")

a = int(input())
b = int(input())
c = int(input())
if a + b == c:
    print("Addition : ", a + b)
elif a - b == c:
    print("Subtraction : ", a - b)
else:
    print("Return 0")
