object Solution {

    def main(args: Array[String]) {
        io.StdIn.readInt()

        var valleys = 0
        var total = 0

        for (i <- io.StdIn.readLine()) {
          if (i == 'U') {
            total = total + 1
          } else if (i == 'D' && total == 0) {
            valleys = valleys + 1
            total = total - 1
          } else {
            total = total -1
          }
        }

        println(valleys)
      }
}