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


int main() {
    int n; std::cin >> n;
    
    int altitude = 0;
    int valleys = 0;
    for(int i = 0; i < n; i++) {
        char c; std::cin >> c;
        
        int altitudeAtLastStep = altitude;
        if(c == 'U') {
            altitude++;
        } else if(c == 'D') {
            altitude--;
        }
        
        // took a step from sealeavel into the valley
        if(altitudeAtLastStep == 0 && altitude == -1) {
            valleys++;
        }
    }
    
    std::cout << valleys << '\n';
    
    return 0;
}