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


int main() {
    int n = 0;
    cin >> n;
    int state = 0;
    int height = 0;
    int res = 0;
    int prevres = 0;
    int cur = 0;
    string cons;
    cin >> cons;
    int i = 0;
    while (i < n) {
        if (cons[i] == 'D') {
            int j = i;
            while (cons[j] == 'D') {
                j++;
            }
            cur = j-i;
            res -= cur;
            i = j;
        }
        if (cons[i] == 'U')  {
            int j = i;
            while (cons[j] == 'U') {
                j++;
            }
            cur = j-i;
            prevres = res;
            res += cur;
            if ((prevres < 0) && (res >= 0)) {
                height++;
            }
            i = j;
        }
    }
    cout << height;
    return 0;
}