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

string str;

int main() {
    int n, c = 0, res = 0;
    cin >> n >> str;
    for (int i = 0; i < n; ++i) {
        if (str[i] == 'U') {
            ++c;
            if (!c) ++res;
        }
        else --c;
    }
    cout << res;
    
    return 0;
}