#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 v=0,s=0,f=-1,n;
    cin>>n;
    string str;
    cin>>str;
    for(int i=0;str[i]!='\0';i++){
         if(str[i]=='U')
            ++s;
        if(str[i]=='D')
            --s;
        if(s<0)
            f=0;
       
        if(s==0)
           {
            if(f==0)
            {    ++v;
                f=-1;
            
            }
        }
            
       
        
    }
    cout<<v;
    return 0;
}