#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 stepCount = 0,downCount = 0,valleyCount = 0;
    cin>>stepCount;
    //char *seq = new char(stepCount);
    string seq;
    cin>>seq;
    for(int i = 0;i< stepCount;i++)
    {
      if(seq[i] == 'D')
        downCount--;
      else if(seq[i] == 'U')
        downCount++;
      if(seq[i] == 'U' && downCount == 0)
      {
        valleyCount++;
        downCount = 0;
      }
    }
    cout<<valleyCount;
    return 0;
}