// Perform the logic for solving the problem.
function process ( n )
{
var fileLines = fs.readFileSync (
'data/euler0013.txt' ).toString ().split ( /\r?\n/ );
var number = new BigInteger ();
// add all the numbers together
for ( var i = 0; i < fileLines.length; ++i )
number = number.plus ( new BigInteger ( fileLines [i] ) );
// return the first 10 digits
return number.toString ().slice ( 0, 10 );
}
bigNumberReadIntBE: function (buffer, offset, byteLength) {
offset = offset >>> 0
byteLength = byteLength >>> 0
var i = byteLength
var mul = new BigInt("1");
var val = new BigInt(buffer[offset + --i]);
while (i > 0 && (mul = mul.times(0x100))) {
var temp = new BigInt(buffer[offset + --i]);
val = val.plus(temp.times(mul));
}
mul = mul.times(0x80);
if (val.greater(mul)) {
var subtrahend = new BigInt(2);
val = val.minus(subtrahend.pow(8 * byteLength));
}
return val
}