compile c# online

input: 00, output: 0
input: 01, output: 1
input: 03, output: 2
input: 07, output: 3
input: 0F, output: 4
input: 1F, output: 5
input: 3F, output: 6
input: 7F, output: 7
input: FF, output: 8
input: 1FF, output: 9
input: 3FF, output: 10
input: 7FF, output: 11
input: FFF, output: 12
input: 1FFF, output: 13
input: 3FFF, output: 14
input: 7FFF, output: 15
input: FFFF, output: 16
input: 1FFFF, output: 17
input: 3FFFF, output: 18
input: 7FFFF, output: 19
input: FFFFF, output: 20
input: 1FFFFF, output: 21
input: 3FFFFF, output: 22
input: 7FFFFF, output: 23
input: FFFFFF, output: 24
input: 1FFFFFF, output: 25
input: 3FFFFFF, output: 26
input: 7FFFFFF, output: 27
input: FFFFFFF, output: 28
input: 1FFFFFFF, output: 29
input: 3FFFFFFF, output: 30
input: 7FFFFFFF, output: 31
input: FFFFFFFF, output: 32