#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 */   
    
    int n,count=0,i,j=0,k=-1,flag=0;
    char a[1000000];
    cin>>n;
    cin>>a;
    //cout<<a;
    
    for(i=0;i<n;i++)
        {
        
        if(a[i]=='U')
            {
            j++;
            
            
        }else
            {
         j--;
            
            }
        //cout<<j<<endl;
        
   
       
        if(j==0 && a[i]=='U')
        k=0;
        
        if(k==0)
            {
            flag=1;
        }
             if(flag==1 && j==0)
            {
           // cout<<"hi"<<endl;
            count++;
            flag=0;
            k=-1;
        }
       //cout<<"---"<<endl; 
        
        
    }
    
     // cout<<flag<<k<<endl;
    
    cout<<count<<endl;
   // cout<<"mama";
    return 0;
}