import scala.io.StdIn
object Solution {

    def main(args: Array[String]) {
        val n = readInt
        val steps = readLine
        var h = 0;
        var lasth = 0;
        var valley = 0;
        for(s <- steps)
        {
            lasth = h;
            if(s == 'D')
                h -= 1
            else
                h += 1
            if(lasth == -1 && h == 0)
                valley += 1            
        }
        System.out.println(valley)

    }
}