#include <bits/stdc++.h>
using namespace std;
int n, res, lv, cnt;
char dir;

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