object Solution {

    def main(args: Array[String]) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution
*/
        val numberOfSteps = readInt()
        val steps: String = readLine()
        
        def CountingValleys(numberOfSteps: Int, steps: String){

          var noOfValleys: Int = 0
          var seeLevel: Int = 0
          var valley: Boolean = false

          for(c <- 0 until numberOfSteps){
            if(steps(c) == 'U') {
              seeLevel += 1; checkAndCountValley()
            }else if(steps(c) == 'D') {
              seeLevel -= 1; checkAndCountValley()
            }
          }

          def checkAndCountValley() = {
            if(valley && seeLevel == 0){
              noOfValleys += 1; valley = false
            }else if(seeLevel < 0 && (valley == false)) valley = true
          }
          println(noOfValleys)
        }

        CountingValleys(numberOfSteps, steps)        
    }
}