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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int steps;
    string hike;
    cin>>steps;
    cin>>hike;
    int dir = 0;
    char  d;
    int pos = 0;
    int valley = 0;
    for (unsigned i=0; i<steps; ++i)
    {
    d = hike.at(i);
        
        if(d == 'U') 
            dir = 1;
       if(d == 'D')
            dir = -1;
        
        pos = pos + dir;
        
        if(dir==1 && pos==0) valley++;
        
        
    }
    cout<<valley;
   //  cout<<d;  
        
    return 0;
}