#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    
     long long int N;
    int level = 0;
    int valley;
    int answer=0;
    char input;
    
    cin >> N;
    
    for(long long int i=0;i<N;i++)
	{
		
        cin >> input;
            
        if(input == 'U')
        {
        	level++;
		}
        else 
        {
        	level--;
		}
        
        if(level<0)
		{
			valley=true;
		} 
        else 
        {
        	valley=false;
		} 
        
        if(level== -1 && input=='D' && valley) 
        {
        	answer++;
		}
		
        
    }
    
    cout << answer << endl;
    
    
    
    
    return 0;
}