#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;
    cin>>n;
    string hike;
    cin>>hike;
    int level;
    int mountain = 0;
    int valley = 0;
    for(int i=0; i<n; i++){
        if(hike[i] == 'U' && level == 0){
            level++;
            mountain++;
        }
        else if(hike[i] == 'D' && level == 0){
            level--;
            valley++;
        }
        else if(hike[i] == 'U' && level != 0){
            level++;
        }
        else if(hike[i] == 'D' && level != 0){
            level--;
        }
    }
    cout<<valley<<endl;
    return 0;
}