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


int main() {

    int n;
    cin >> n;
    
    int height = 0;
    bool inValley = false;
    int valleys = 0;
    
    for (int i = 0; i < n; i++)
    {
        char val;
        cin >> val;
        
        if (val == 'U')
        {
            height++;
            
            if (height == 0 && inValley)
            {
                //lastPeak = height;
                valleys++;
                inValley = false;
            }
        }
        else // val == D
        {
            if (height == 0)
            {
                //lastPeak = height;
                inValley = true;
            }
            
            height--;
        }
    }
    
    if (inValley) valleys++;
    
    cout << valleys << endl;
    
    return 0;
}