#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int n, level = 0, prev_level = 0, count = 0;
    char in;
    
    cin >> n;
    
    while ( n-- ) {
        cin >> in;
        
        if ( in == 'U' )
            ++level;
        else
            --level;
        
        if ( level == 0 && prev_level < 0 )
            ++count;
        
        prev_level = level;
    }
    
    cout << count << endl;
    
    return 0;
}