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

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 in = new Scanner(System.in);
        int steps = in.nextInt();
        in.nextLine();
        String desc = in.nextLine();
        int cState = 0, nState;
        int count = 0;
        char state = 's';
        char c;
        for(int step = 0; step < steps; step ++){
            c = desc.charAt(step);
            if(c == 'U'){
                nState = 1;
            }else{
                nState = -1;
            }
            cState += nState;
            if(cState <= -1){
                state = 'd';
            }
            else if(cState == 0 && state == 'd'){
                count += 1;
                state = 's';
            }
        }
        System.out.println(count);
    }
}