#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;
    string s;
    
    cin >> n;
    cin >> s;
    
    const char *x = s.c_str();
    
    int counter = 0, v = 0;
    bool down = false;
    
    for (int i = 0; i < n; i++) {
        if (counter < 0) {
            down = true;            
        } else { 
            down = false;
        }
        
        if (s[i] == 'U') {
            counter++;
        }
        
        if (s[i] == 'D') {
            counter--;
        }
        
        if (counter == 0 && down) {
            v++;
        }
    }
    
    cout << v << endl;    
    return 0;
}