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


int main() {
    size_t n;
    char step;
    
    cin >> n;
    int level = 0;
    int num = 0;
    
    bool isInValley = false;
    
    for (size_t i = 0; i < n; ++i) {
        cin >> step;
        
        if (step == 'U') 
        {
            ++level;
            if (level == 0) {
                ++num;
                isInValley = false;
            }
        }
        else
        if (step == 'D')
        {
            if (level == 0) {
                isInValley = true;
            }
            --level;
        }
    }
    
    cout << num;
    return 0;
}