Sum informations in file....

[Alexandre via Digitalmars-d-learn]

I have one file with a lot of numeric data... and I need to sum 
all that data...

That is my actual code:

module main;

import std.stdio;
import std.file;
import std.conv : to;

int main(string[] args)
{
	auto f = File("oi.txt");
	auto r = f.byLine();

	auto tot = 0;
	foreach(line;r)
	{
		if(line[0] == '1')
			tot += to!int(line[253..266]);
	}

	writeln(tot);
	return 0;
}

I want to know if have a more better way to make this... maybe 
using lambda or tamplates....