#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;
    //cout << n;
    char str[n];
    for(int i = 0; i < n; i++){
        cin >> str[i];
    }
    int count = 0;
    
    int i = 0;
    while(n){
        
        int cu = 0;
        int cd = 0;
        if(str[i] == 'U'){
            while(cu!= cd || (cu ==0 && cd == 0)){
                if(str[i] == 'U')
                    cu++;
                else
                    cd++;
                i++;
                n--;
            }
        }
        
        else{
            while(cu!= cd || (cu ==0 && cd == 0)){
                if(str[i] == 'U')
                    cu++;
                else
                    cd++;
                i++;
                n--;
            }
            count++;
            
    } 
  }
    
    cout << count;
    //return 0;
}