--Bytelandian Exchange 1
--Initialize
coinValue = 0
--Get positive integer
while( coinValue < 1 ) do
	print( "Insert coin:")
	coinValue = math.floor( tonumber( io.read() ) )
end
--Exchange coin recursively
function exchange( coin )
	if( coin == 0 ) then
		return 1
	else
		return exchange( math.floor( coin/2 ) ) + exchange( math.floor( coin/3 ) ) + exchange( math.floor( coin/4 ) )
	end
end
--Output
print( "You get back " .. exchange( coinValue ) .. " 0-value coins." )