static void Main(string[] args)
{
using (reader = File.OpenText("input.txt"))
using (writer = new StreamWriter(File.Create("output.txt")))
{
int m = reader.ReadInt();
CustomQueue <int> queue = new CustomQueue <int>(m + 1);
while (m > 0)
{
var cmd = reader.ReadToken();
int value;
switch (cmd)
{
case "+":
int number = reader.ReadInt();
queue.Enqueue(number);
break;
case "-":
value = queue.Dequeue();
break;
case "?":
value = queue.Min();
writer.WriteLine(value);
break;
}
m--;
}
}
}