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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    int n;
    cin >> n;
    int lev = 0;
    int v = 0;
    bool down = false;
    for(int i=0;i<n;i++){
        char c;
        cin >> c;
        if(c=='U'){
            lev++;
            if(lev==0){
                v++;
            }
        }else{
            lev--;
        }
    }
    cout << v << endl;
    return 0;
}