input = 0000, output=0000000000000001
input = 0001, output=0000000000000010
input = 0010, output=0000000000000011
input = 0011, output=0000000000000100
input = 0100, output=0000000000000101
input = 0101, output=0000000000000110
input = 0110, output=0000000000000111
input = 0111, output=0000000000001000
input = 1000, output=0000000000001001
input = 1001, output=0000000000001010
input = 1010, output=0000000000001011
input = 1011, output=0000000000001100
input = 1100, output=0000000000001101
input = 1101, output=0000000000001110
input = 1110, output=0000000000001111
input = 1111, output=0000000000010000
input = 0000, output=0000000000000001