#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,i=0,c=0,flag=0,v=0;
    string s;
    cin>>n;
    cin>>s;
    
    for( i=0;i<n;i++ )
    {    {  if( s[i]=='U')
              c++;
           else if( s[i]=='D')
              c--;
        }
        if(flag==0)
            if(c==-1)
               v++;
        
        if(c==0)
            flag=0;
        else flag=1;    
    }
    
    cout<<v;
    return 0;
}