#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
int check(int x)
    { 
    if(x==0)
       {
       
    return 1;
    }
     else
         return 0;
}
 
int main() {
    int n,s=0,k=0,i=0;
    cin>>n;
    char a[n];
    for(i=0;i<n;i++)
        {
        cin>>a[i];
    }
    for(i=0;i<n;i++)
        {    if(a[i]=='U')
            {
            s++;
            k+=check(s);
        }
      else if(a[i]=='U' && a[i+1]=='D')
          { 
           s++;
          k+=check(s);
          }
        else if(a[i]=='D' && a[i+1]=='D')
            {
            s--;
        }
        else if(a[i]=='D' && a[i+1]=='U')
            { s--;
            //k+=check(s);
        }
       
            }
  cout<<k;
    
    return 0;
}