#include <iostream>
#include <cmath>
#include <vector>
#include <algorithm>
#define every(iter,iterable) for(typeof((iterable).begin()) iter =iterable.begin();iter!=iterable.end();iter++)
#include<string.h>
#include<stack>


using namespace std;



int main()
{

    int n;
    cin>>n;
    string s;
    cin>>s;
    int check=0;
    int flag;
    int counter=0;
    if(s.at(0)=='U')
    {
        flag=1;

        counter=1;
    }
    else{
        flag=0;
        counter=-1;
    }
    for(int i=1;i<s.length();i++)
    {
        if(counter>0)
        {
            flag=1;
        }
        else if(counter<0)
        {
            flag=0;
        }
        if(s.at(i)=='U')
        {
            counter++;
        }
        else{
            counter--;
        }
        if(counter==0 && flag==0)
        {

            check++;
        }
    }

    cout<<check;

    return 0;
}