import java.io.{BufferedOutputStream, BufferedReader, InputStreamReader, PrintWriter}

object Main {
  def main(args: Array[String]): Unit = {
    val in = new BufferedReader(new InputStreamReader(System.in))
    val out = new PrintWriter(new BufferedOutputStream(System.out))
    val Array(n, p) = in.readLine().split("\\s+").map(_.toInt)
    val s = in.readLine().toCharArray.reverse.map(_.toInt - '0')

    def getRemainders() = {
      val remainders = Array.ofDim[Int](n)

      var base = 1
      for {
        i <- s.indices
      } {
        remainders(i) = base * s(i) % p
        base = base * 10 % p
      }

      remainders
    }
    val m = getRemainders()

    def getSumOfRemainders() = {
      val sumOfRemainders = Array.ofDim[Int](n + 1)

      sumOfRemainders(0) = 0
      for {
        i <- m.indices
      } {
        sumOfRemainders(i + 1) = (sumOfRemainders(i) + m(i)) % p
      }

      sumOfRemainders
    }
    val sm = getSumOfRemainders()

    val remainders = Array.ofDim[Int](10001)
    for {
      asm <- sm
    } {
      remainders(asm) += 1
    }

    var count = 0L
    for {
      r <- remainders
      if r > 1
    } {
      count += r * (r - 1) / 2
    }

    out.println(count)
    out.flush()
  }
}
