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


int main() {
    int n,counter=0,var=0,i,previous;
    cin>>n;
    char ch[n];
    cin>>ch;
    for(i=0;i<n;i++)
        {
        if(ch[i]=='U')
            {
            previous=var;
            var++;
        }
        else
            {
            previous=var;
            var--;
        }
        if(previous<0 && var==0)
            {
            counter++;
        }
    }
    cout<<counter<<endl;
    return 0;
}