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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    int n;
    cin >> n;
    char str[n];
    cin >> str;
    int count = 0;
    int ht = 0;
    char t;
    bool up = false;
    for(int i=0;i<n;i++){
        t = str[i];
        if(t=='U'){            
            ht++;
            up = true;
            //cout << ht << endl;
        }            
        else if(t=='D'){            
            ht--;
            up = false;
            //cout << ht << endl;
        }
        if(ht==0 && up){
            //cout << "count " << ht << endl;
            count++;
        }            
    }
    cout << count;
    return 0;
}