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

int fun(char *a,int n)
    {
    int s=0,st=0,c=0;
    for(int i=0;i<n;i++)
     {
        if(a[i]=='U')
            s+=1;
        else
            s-=1;
         if(s>0)
              st=1;
         if(s<0)
              st=-1;
         if(s==0 && st==-1)
              c++;
    }
    cout<<c<<endl;
    return 0;
}

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    cin>>n;
    char a[n];
    for(int i=0;i<n;i++)
        cin>>a[i];
    fun(a,n);
    return 0;
}