In my UNO pin 0 doen't work as an input

Hello I tried all of pins from 1 to 13 , they work perfectly ,exept pin 0,if i put it as an output ,it works ,but as an input it acts like a pin in the air. Please help me.

Pins 0 and 1 are connected to the USB to serial chip, and you should avoid using them as GPIO pins.

i should or i have to ??!!

yacinelyess: i should or i have to ??!!

I'm not sure of the exact connections to that pin, and can't be bothered searching the UNO schematic to find out. Have a good look at the schematic and I'm sure your question will be answered.

OldSteve: I'm not sure of the exact connections to that pin, and can't be bothered searching the UNO schematic to find out. Have a good look at the schematic and I'm sure your question will be answered.

Ok,thank you so much brother