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


int main() {
    int N;
    int lv = 0;
    int c=0;
    char ch;
    
    cin >> N;
    while(N--){
        cin >> ch;
            
        if(ch == 'U')lv++;
        else lv--;
                
        if(lv== 0 && ch=='U' ) c++;
    }
    cout << c << endl;
    return 0;
}