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


int main() {
    int n;
    cin >> n;
    int x = 0;
    int v = 0;
    for (int i = 0; i < n; i++) {
        char c;
        cin >> c;
        if (c == 'U') {
            x++;
        } else {
            x--;
        }
        if (x == 0 && c == 'U') {
            v++;
        }
    }
    cout << v;
    return 0;
}