#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;
    int cloc=0;
    int vally_count=0;
    int sh=0;
    for(int i=0;i<n;i++)
        {
        char step;
        cin>>step;
        if(step=='U')
            cloc++;
        if(step=='D')
            cloc--;
        if(cloc==0)
            {
            if(sh<0)
                vally_count++;
        }
        sh=cloc;
    }
    cout<<vally_count;
    return 0;
}