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


int main() {
    int n;
    string steps;
    cin >> n >> steps;
    
    int loc = 0;
    int count = 0;
    
    for(int i = 0; i < n; i++) {
        char step = steps[i];
        if(loc == -1 && step == 'U') {
            count ++;
            loc++;
        } 
        else if(step == 'U') {
            loc++;
        } else {
            loc--;
        }
    }
    
    cout << count;
    
    return 0;
}