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


int main() {
   int n,len,i,count=0,res=0;
      cin>>n;
    
    string s;
    cin>>s;
    for(i=0;i<n;i++)
        {
        if(s[i]=='U')
            count++;
        if(s[i]=='D')
            count--;
        if(count==0 && s[i]=='U')
            res++;
    }
    cout<<res;
    return 0;
}