using System;
using System.Collections.Generic;
using System.IO;

class Solution {
	public static class Hike{
		private static int _intLength;
		private static List<int> _intSteps = new List<int>();
		
		public static List<int> Steps{
			get { return _intSteps; }
			set { _intSteps = value; }
		}
		
		public static int Length{
			get { return _intLength; }
			set { _intLength = value; }
		}
		
		public static void ReadLine(string value){
			foreach(char chr in value.ToCharArray()){
				switch(chr){
					case 'U':
						Steps.Add(1);
						break;
					default:
						Steps.Add(-1);
						break;
				}
			}
		}
		
		public static void FindValleys(){
			int seaLevel = 0;
			int valleyCount = 0;
			bool bIsAbove = true;
			foreach(int step in Steps){
				seaLevel += step;
				if (seaLevel < 0){
					if(bIsAbove){
						valleyCount++;
						bIsAbove = false;
					}
				} else {
					bIsAbove = true;
				}
			}
			
			Console.WriteLine(valleyCount);
		}
	}
	
	static void Main(String[] args) {
        Hike.Length = Convert.ToInt32(Console.ReadLine().Trim());
		Hike.ReadLine(Console.ReadLine().Trim());
		Hike.FindValleys();
    }
}