static void Main(string[] args)
{
BigInteger[] ints = new BigInteger[100];
string[] vals = numbers.Split('\n');
for (int i = 0; i < ints.Length; i++)
{
ints[i] = BigInteger.Parse(vals[i]);
}
Console.WriteLine(ints.Aggregate((result,next) => result += next).ToString().Substring(0,10));
Console.ReadKey();
}