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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
   
        int len;
        cin>>len;
        char s[len];
        int count=0,hill=0,valley=0,flag=0;
        cin>>s;
        for(int i=0;i<len;i++)
        {
            if(s[i]=='U')
            {
                count++;    
                flag=0;
            }
            if(s[i]=='D')
               {
               count--;
               flag=1; 
               }
            if(count==0 && flag==0)
                valley++;
        }
        
        cout<<valley<<endl;
    
    return 0;
}