fn main
[
	var lines := list_break_to_lines(read_lazy(h[0]));
	var sum := 0;
	for line in lines do [
		var c := list_search(line, ':');
		line := line[c + 1 .. ];
		var winning : uint128 := 0;
		var n_winning := 0;
		var pass := false;
		while len_greater_than(line, 0) do [
			if list_begins_with(line, " |") then [
				line := line[2 .. ];
				pass := true;
				continue;
			]
			if line[0] <> ' ' then
				abort;
			if line[1] = ' ' then
				line[1] := '0';
			var num := 10 * (line[1] - '0') + line[2] - '0';
			line := line[3 .. ];
			if not pass then
				winning bts= num;
			else
				if winning bt num then n_winning += 1;
		]
		if n_winning <> 0 then
			sum += 0 bts (n_winning - 1);
	]
	write(h[1], ntos(sum) + nl);
]