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



int main() {
    int n;
    cin>>n;
    string str;
    cin>>str;
    int sealevel=0;
    int temp=0;
    int count=0;
    for(int i=0;i<n;i++)
        {
        if(str[i]=='D')
            sealevel=sealevel-1;
        else
            sealevel=sealevel+1;
        if(sealevel==0)
            {
                int temp1=i;
            int count1=0;
            if(temp1!=1)
            for(int j=temp1;j>temp+1;j--)
                {
                if(str[j]=='D')
                    count1=count1-1;
                else
                    count1=count1+1;
            }
            else
                {
                    if(str[1]=='U')
                        count1=count1+1;
            }
            temp=i;
            if(count1>0)
               ++count;
        }
    }
    cout<<count;
    return 0;
}