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


int main() {
    int n;
    int x;
    int move = 0;
    int v = 0;
    char u('U');
    
    cin >> n;
    char c[n];
    
    for (x = 0; x < n; x++) {
        cin >> c[x];
        if (move == -1 && c[x] == u) {
            v++;
        }
        if (c[x] == u) {
            move++; 
        }
        else {
            move--;
        }
        
    }
    cout << v;
    return 0;
}