#include <iostream>
#include <algorithm>
using namespace std;
int n, res, lv, cnt;
char c;

int main() {
    cin >> n;
    for(int i = 1; i <= n; i++) {
        cin >> c;
        if(c == 'U') {
            lv++;
            if(!lv) res++;
        }
        if(c == 'D') lv--;
    }
    cout <<res;
    return 0;
}