Back in my college prime and I was knee deep in the stuff, I was the guy that would do an integral in my head and then screw up the subtraction at the end. I've

Back in my college prime and I was knee deep in the stuff, I was the guy that would do an integral in my head and then screw up the subtraction at the end. I've just always been bad at mental arithmetic, and don't put in the practice to get better because it just doesn't affect my life that much. So yes, we exist.