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


int main() {
    int n;
    cin >> n;
    int height = 0;
    int count = 0;
    for(int i = 0; i < n; ++i) {
        int step;
        char in;
        cin >> in;
        if(in == 'U') step = 1;
        else if(in == 'D') step = -1;
        
        if(height == 0 && step == -1) ++count;
        height += step;
    }
    cout << count;
    
    return 0;
}