#try to avoid input function
a = int(input("Enter Number of Classes held : "))
b = int(input("Enter Number of Classes attended : "))
c = input("Medical Issues : ")
d = (b/a)*100 ## for calculating percentage.
if c == "Yes" or c == "yes" or c == "s":
if d >= 65:
print("You are allowed.")
else:
print("You are not allowed.")
elif d >= 75:
print("You are allowed.")
else:
print("You are not allowed.")
Click the run button. Try to avoid input() function.