#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 currentLevel = 0, numValleys = 0, numSteps;
    cin >> numSteps;
    for (int i = 0; i < numSteps; i++) {
        char step;
        cin >> step;
        if (step == 'U') {
            currentLevel++;
            if (currentLevel == 0)
                numValleys++;
        }
        else
            currentLevel--;
    }
    cout << numValleys;
    return 0;
}