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

		public class Solution {

		    public static void main(String[] args) {
		         Scanner s = new Scanner(System.in);
		        int n = s.nextInt();
		        String pat = s.next();
		        char arr[] = pat.toCharArray();
		        int val[] = new int[n];
		        int i,d=0,c=0;
		        for(i = 0;i<n;i++){
		        	if(arr[i]=='U'){
		        		d++;
		        		val[i]=d;
		        	}
		        	if(arr[i]=='D'){
		        		d--;
		        		val[i]=d;
		        	}
		        }
		        for(i=0;i+1<n;i++) {
		        	if(val[i]==0 && val[i+1]<0){
		        	c++;
		        	}
		        	
		        	
		        }
		        if(val[0]==-1)
		        	c++;
		        System.out.print(c);
		        	}
		        }