#include <iostream>

using namespace std;

int main() {
    int n;
    cin >> n;
    char step;
    int height = 0;
    int valleys = 0;
    for (int i=0;i<n;i++){
        cin >> step;
        if (step=='U'){
            height++;
            if (height == 0){
                valleys++;
            }
        }
        else if (step=='D'){
            height--;
        }
    }
    cout << valleys;
    return 0;
}