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


int main() {
    int n,counter=0,a=0,prev=0;
    cin>>n;
    char c[n];
    cin>>c;
    for(int j=0;j<n;j++){
        if(c[j]=='U'){
            prev=a;
            a++;
        }
        else{
            prev=a;
            a--;
        }
        if(prev<0 && a==0){
            counter++;
            continue;
        }
    }
    cout<<counter<<endl;
    return 0;
}