mirror of
https://github.com/tiennm99/codeforces.git
synced 2026-06-09 06:13:28 +00:00
19 lines
310 B
C#
19 lines
310 B
C#
using System;
|
|
|
|
namespace _478A
|
|
{
|
|
class Program
|
|
{
|
|
static void Main(string[] args)
|
|
{
|
|
int[] a = Array.ConvertAll(Console.ReadLine().Split(), int.Parse);
|
|
int sum = 0;
|
|
for (int i = 0; i < 5; i++)
|
|
{
|
|
sum += a[i];
|
|
}
|
|
Console.WriteLine((sum % 5 == 0 && sum != 0) ? sum / 5 : -1);
|
|
}
|
|
}
|
|
}
|