#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 N;
    cin>>N;
    char A[N];
    for(int i=0;i<N;i++)
        cin>>A[i];
    int u=0;
    int d=0;
    int valley=0;
        for(int i=0;i<N;i++)
        {
          if(A[i]=='U')
              u++;
          else
              d++;
          if(u==d && A[i]=='U')
              valley++;
        }
    cout<<valley<<endl;
    return 0;
    
}