#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 s;
    cin>>s;
    int pre=0;
    int a[n];
    for(int i=0;i<n;i++)
    {
        if(s[i]=='U')
            a[i]=pre+1;
        else
            a[i]=pre-1;
        pre=a[i];
    }
    int cnt=0;
    for(int i=0;i<n;i++)
    {
        if(a[i]<0)
            {
            i++;
            while(a[i]<0 && i<n){
                i++;
            }
            if(i==n){
                cout<<cnt;
                return 0;
            }
            cnt++;
        }
    }
    cout<<cnt;
    return 0;
}