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

#define SEALEVEL 0
int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    bool inValley = false;
    int height = SEALEVEL;
    int N;
    int count = 0;
    string steps; 
    cin>>N>>steps;
    for (int i = 0; i < N; i++) {
        if (steps[i] == 'U') {
            height++;
            if (inValley && (height == SEALEVEL)) {
                inValley = false;
                count++;
            }
        } else {
            if (height == SEALEVEL) { inValley = true;}
            height--;
        }
    }
    cout<<count<<endl;
    return 0;
}