#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 n,pos,v,flag;
    
    cin>>n;
    char str[1000005];
    cin>>str;
    
    pos=0;
    v=0;
    flag=0;
    for(long long i=0;i<n;i++)
        {
          if(str[i]=='U')
              pos++;
          else
              pos--;
        
        if(pos<0)
            flag=1;
        
        if(pos>=0 && flag==1)
        {v++; flag=0;}
          
          
        
         }
    cout<<v;
    return 0;
}