#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;
    
    string steps;
    cin >> steps;
    
    int level = 0;
    int valleys = 0;
    for(int i = 0; i < n; ++i){
        if (steps[i] == 'U'){
            ++level;
            if (level == 0){
                ++valleys;
            }
        }else{
            --level;
        }
        
    }
    
    cout << valleys;
    return 0;
}