#try to avoid input function
a = int(input("Enter your subject1 marks :"))
b = int(input("Enter your subject2 marks :"))
c = int(input("Enter your subject3 marks :"))
if a >= 15 and b >= 15 and c >= 15:
if a+b+c >= 65:
print("You got First class.")
elif a+b+c > 55:
print("You got Second class.")
else:
print("Your Passed.")
else:
print("Your Failed.")
Click the run button. Try to avoid input() function.