#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 usum=0,dsum=0,i,level=0,v;
    long int n;
    char step;
    cin>>n;
    for(i=0;i<=n-1;i++)
        {cin>>step;
        if(step=='U')
        {usum=usum+i;
         level++;}
        else
        {dsum=dsum+i;
        level--;}
       if(level==0)
           {if((usum-dsum)>0)
           {v++;}
            usum=dsum=0;}
        }
    cout<<v;
    return 0;
}