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


int main() {
    int n;
    cin>>n;
    string str;
    cin>>str;
    int status=0;
    int ans=0;
    bool flag=true;
    for(int i=0;i<n;i++)
        {
        switch(str[i])
            {
            case 'U' : status++;break;
            case 'D' : status--;break;
        }
        if(status<0 && flag)
            {ans++;flag=false;}
        if(status==0)
            flag=true;
    }
    cout<<ans;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}