#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 valleyCount = 0;
    long currHeight = 0;
    long n;
    cin >> n;
    char step;
    for(int i=0;i<n;i++){
        cin >> step;
        if(step=='U'){
            currHeight++;
            if(currHeight==0){
                valleyCount++;
            }
        }else{
            currHeight--;
        }
    }
    cout << valleyCount << endl;
    return 0;
}