#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include<string.h>
#include <algorithm>
#include<stack>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    int n;
    cin>>n;
    string s;
    cin>>s;
    int d=0;
    int u=0;
    int c=0;
    int f=0;
    int x=0;
    int y=0;
    //cout<<s[3];
    stack<char> st;
    for(int i=0;i<n;i++)
        {if(st.empty())
            {
            st.push(s[i]);
        }
         else
             {
             if(s[i]!=st.top())
                 {
                 if(s[i]=='U')
                 {st.pop();
                  if(st.empty())
                      {
                      c++;
                  }
                 }
                 else
                     {
                     st.pop();
                 }
             }
             else
                 {
                 st.push(s[i]);
             }
         }
        
            }
    
        cout<<c<<endl;
    return 0;
}