#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 */  
    char hike[1000000];
    int n,count=0,level=0,next;
    cin>>n;
    for(int i=0; i<n ; i++)
        cin>>hike[i];
    for(int i=0; i<n ;i++)
    {
        if(hike[i] == 'U')
            next = +1;
        else
            next = -1;
        
        if(level < 0 && (level+next == 0) )
            count++;
        
        level = level + next;    
    }
    
    cout<<count;
}