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


int main() {
    int n;
    cin >> n;
    
    char ch;
    int level = 0;
    int cnt = 0;
    bool flag = true;
    for(int i = 0; i<n; i++) {
        cin >> ch;
        if(ch == 'U') {
            level++;
        }
        else {
            level--;
        }
        
        if(level < 0) {
            if(flag) {
                cnt++;
                flag = false;
                      }
        }
        if(level == 0) {
            flag = true;
        }
    }
    
    cout << cnt << endl;
    return 0;
}