private static void Main()
{
var n = Convert.ToInt32(Console.ReadLine());
var input1 = Console.ReadLine().Split(' ');
var array1 = Array.ConvertAll(input1, int.Parse).OrderBy(x => x).ToArray();
var input2 = Console.ReadLine().Split(' ');
var array2 = Array.ConvertAll(input2, int.Parse).OrderBy(x => x).ToArray();
var arrayDiff = new System.Numerics.BigInteger[array1.Length];
string res;
for (var x = 0; x < n; x++)
{
var val1 = array1[x];
var val2 = array2[x];
arrayDiff[x] = val1 - val2;
}
var sum = arrayDiff.Aggregate((currentSum, item) => currentSum + item);
if (sum == 0)
{
System.Numerics.BigInteger totalAbs = 0;
foreach (var item in arrayDiff)
{
totalAbs += System.Numerics.BigInteger.Abs(item);
}
res = $"{totalAbs / 2}";
}
else
{
res = "-1";
}
Console.WriteLine(res);
//Console.ReadLine();
//for (var x = 0; x < n; x++)
//{
// var val1 = array1[x];
// var val2 = array2[x];
// while (val1 != val2)
// {
// if (val1 > val2)
// {
// arrayDiff[x]--;
// val1--;
// }
// if (val1 < val2)
// {
// arrayDiff[x]++;
// val1++;
// }
// }
//}
//Console.Clear();
//Console.WriteLine(array1.Aggregate("", (current, item) => current + (item + ", ")));
//Console.WriteLine(array2.Aggregate("", (current, item) => current + (item + ", ")));
//Console.WriteLine(arrayDiff.Aggregate("", (current, item) => current + (item + ", ")));
//Console.ReadLine();
}