import java.io.*;
import java.util.*;

public class Solution {

    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 sc = new Scanner(System.in);
        int numSteps = sc.nextInt();
        String steps = sc.next();
        int seaLevel = 0, valleys = 0, mountains = 0;
        for( int i = 0; i < numSteps; i++ ) {
            char lastStep = steps.charAt(i);
            if( lastStep == 'U' ) {
                seaLevel++;
            } else if ( lastStep == 'D' ) {
                seaLevel--;
            }
            
            if( seaLevel == 0 && lastStep == 'U' ) {
                valleys++;
            }
            if( seaLevel == 0 && lastStep == 'D' ) {
                mountains++;
            }
        }
        System.out.println(valleys);
    }
}