Object counter via IR sensor

Hello, I'm designing a simple object counter whereby it will be installed at a box. The main purpose is to count the number of object being throw into the box. I'm using arduino Uno as microcontroller, IR sensor to sense for object and 4 x 7 segment LED to display my number of count and a push button to reset the number of count. Pins as allocated, IR sensor = A0 Button = 6 pinA = 13; pinB = 11; pinC = 5; pinD = 7; pinE = 8; pinF = 12; pinG = 4; digit1 = 9; digit2 = 10; digit3 = 3; digit4 = 2; I've no problem in displaying 0-9 count. I'm facing issues to display 2 digit. I've tight budget and i hope someone could help me.