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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    int n;
    char c[10000000];
    cin >> n;
    cin >> c;
    //int max = 0;
    int prev = 0;
    int h = 0;
    int hil = 0;
    for(int i = 0; i<n;i++)
    {
        if(c[i] == 'U')
        {
            prev = h;
            h++;
        }
        else{
            prev = h;
            h--;
        }
        if(h == 0 && prev < 0)
        {
           
            hil++;
        }
    }
    cout << hil<<endl;
    return 0;
}