#try to avoid input function
a = int(input())
b = int(input())
c = input()
if c == "+":
print(a+b)
elif c == "-":
print(a-b)
elif c == "x" or c == "*":
print(a*b)
elif c == "/" or c == "//":
print(a//b)
else:
print("Invalid input")
Click the run button. Try to avoid input() function.