#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 =0; cin>>n;
    char*c= new char[n];
    int v=0;
    int cnt = 0, prev_cnt = 0;
    for(int i=0; i<n; i++){
        cin>>c[i];
        
        prev_cnt = cnt;
        
        if(c[i] == 'U')
            cnt++;
        else
            cnt--;
        if((i==0 && cnt==-1 ) || (cnt==-1 && prev_cnt==0))
            v++;
        
        //cout<< cnt << " ";
    }
    cout<<v;
    return 0;
}