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


int main() {
    int lev = 0;
    
    
    int n;
    string line;
    
    cin >> n;
    cin >> line;
    
    int s = 0;
    
    for(int i = 0; i < n; i++)
    {
        if(line[i] == 'U')
        {
            lev++;
        }
        else if(line[i] == 'D')
        {
            if(lev == 0)
            {
                s++;
            }
            lev--;
        }
    }
    
    cout << s << endl;
    return 0;
}