#include<bits/stdc++.h>
#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
#define ll long long int

int main() {
    ll n;
    cin>>n;
    string s;
    cin>>s;
    ll l=s.length();
 ll c=0;
    ll a[l+1];
    if(s[0]=='U') a[0]=1;
     else a[0]=(-1);
    for(int i=1;i<l;i++){
        ll x=a[i-1];
        if(s[i]=='U') a[i]=++x;
        else a[i]=--x;
        }
    for(int i=1;i<l;i++){
        if(a[i]==0 && a[i]>=a[i-1])
            c++;
    }
    cout<<c<<endl;
    return 0;
}