import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {
    public enum State{Valley,SeaLevel,Mt};
    
    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner s = new Scanner(System.in);
        int numSteps = s.nextInt();
        String steps = s.next();
       
        State state = State.SeaLevel;
        int seaLv = 0; //if sealevel>0 -> mountain; if sealevel<0 valley
        int numValley = 0;
        
        for(int i=0; i<numSteps; i++){
            char c = steps.charAt(i);
            if(c == 'U'){
                seaLv++;
            }else if(c == 'D'){
                seaLv--;
            }else{
                return;
            }

            switch(state){
                case Valley:
                    if(seaLv == 0){
                        state = State.SeaLevel;
                        numValley++;
                    }
                    break;
                case SeaLevel:
                    if(seaLv>0){
                        state = State.Mt;
                    }else if(seaLv<0){
                        state = State.Valley;
                    }else{
                        
                    }
                
                    break;
                case Mt:
                    if(seaLv == 0){
                        state = State.SeaLevel;
                    }
                    break;
                default:
                    return;
            }
        }
        
        System.out.println(numValley);

    }
}