Advertising letters

using System;
class Advertising
{
  static void Main()
  {
    //Telerik Academy
    //How many times you could write the word TAT with the letters given on the 3 input lines.

    string input1 = Console.ReadLine(),
           input2 = Console.ReadLine(),
           input3 = Console.ReadLine();

    string allInput = input1 + input2 + input3;
    int counterT = 0,
        counterA = 0,
        counterAdvertisments = 0;

    foreach (char item in allInput)
    {
      if (item == 'T')
      {
        counterT++;
      }
      if (item == 'A')
      {
        counterA++;
      }
    }

    while (counterT >= 2 && counterA > 0)
    {
      counterAdvertisments++;
      counterA--;
      counterT = counterT - 2;
    }

    Console.WriteLine(counterAdvertisments);
  }
}