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


int main() {
    int n;
    cin >> n;
    string str;
    cin >> str;
    
    int l = 0;
    int val = 0;
    char ps;
    
    for(int i = 0; i < n; i++){
        if(str[i] == 'U'){
            l++;
            //cout << l << endl;
            ps = 'U';
        }
        if(str[i] == 'D'){
            l--;
            //cout << l << endl;
            ps = 'D';
        }
        
        if(ps == 'U' && l == 0){
            val++;    
        }
        
    }
    
    cout << val << endl;
    
    return 0;
}