#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int n;
    cin>>n;
    string s;
    cin>>s;
    int i=0,cnt=0,strt=0,f=0;
    while(i<s.size()){
        if(s[i]=='U'){
            strt++;
        }
        if(s[i]=='D'){
            strt--;
        }
        if(strt<0){
            f=1;
        }
        if(strt==0 && f==1){
            cnt++;
            
            f=0;
        }
        i++;
    }
    cout<<cnt;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}