#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, i, prev=0, level=0, m=0, v=0;
    string s;
    cin>>n;
    cin>>s;
    for(i=0; i<n; i++)
        {
        if(s[i]=='U')
            {
                prev=level;
                level=level+1;
                if(prev==0 && level==1)
                    {
                        m=m+1;
                }
           
        }
        else if(s[i]=='D')
            {
                prev=level;
                level=level-1;            
                if(prev==0 && level==-1)
                    {
                        v=v+1;
                }
        }
    }
    
    cout<<v;
    
    return 0;
}