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


int main() {
    
    int n;
    cin >> n;

    string s;

    cin >> s;

    int level = 0;
    int count = 0;

    for (int i = 0; i < n; ++i)
    {
        if (level == 0 && s[i] == 'D')
        {
            count++;
        }


        if(s[i] == 'U')
        {
            level++;
        }
        else
        {
            level--;
        }
    }

    cout << count << endl;

    return 0;
}