x,y,z=input().split;
x=int(x);y=int(y);z=str(z)
if (z=='+'):
    print(x+y)
elif (z=='-'):
    print(x-y)
elif (z=='*'):
    print(x*y)
elif (z=='/'):
    if (y==0):
        print("Divided by zero!")
    else :
        print(x//y);
else:
    print("Invalid operator!")