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


int main() {
    int n;
    cin >> n;
    string s;
    cin >> s;
    int x = 0,ans = 0;
    for(int i = 0; i < s.length(); i++){
        if(s[i]=='U') x++;
        if(s[i]=='D') x--;
        if(x==0 && s[i]=='U') ans++;
    }
    cout << ans << endl;
    return 0;
}