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

using namespace std;

int totalheight(std::vector<char>& v)
{
    int height=0;
    int valley=0;
    bool valleyflag=false;
    for (std::vector<char>::iterator it = v.begin();it!=v.end();++it)
    {
        if (*it=='D')
        {
            --height;
        }
        if (*it=='U')
        {
            ++height;
        }
        if(height<0 &&valleyflag==false)
        {
            ++valley;
            valleyflag=true;
        }
        else if(height==0)
        {
            valleyflag=false;
        }
    }
    return valley;
        

}

int main(){
    int n;
    cin >> n;
    vector<char> steps(n);
    for(int i = 0;i < n;i++)
    {
       cin >> steps[i];
    }
    cout<<totalheight(steps)<<endl;
    return 0;
}
/*
UDDDUUDDUUDDDUDUUDUU
*/