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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    cin>>n;
    string x;
    cin>>x;
    int count=0,valley=0,mountain=0;
    //cout<<x.substr(0,1).compare("U")<<endl;
    for(int i=0; i<n;i++){
        if(x.substr(i,1).compare("U")==0){
            count++;
        }
        else if(x.substr(i,1).compare("D")==0){
            count--;
        }
        if(count==0 && x.substr(i,1).compare("U")==0){
            valley++;
        }
        else if(count==0 && x.substr(i,1).compare("D")==0){
            mountain++;
        }
    }
    cout<<valley<<endl;
    return 0;
}