#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, count = 0;
    char temp;
    cin >> n;
    int arr[n+1];
    arr[0] = 0;
    for (int i = 0; i < n; i++) {
        cin >> temp;
        if(temp == 'U') arr[i+1] = arr[i] + 1;
        else arr[i+1] = arr[i] - 1;
    }
    
    for (int i = 0; i < n; i++) {
        if(arr[i+1] == 0){
            if(arr[i] == -1) count++;
        }
    }
    
    cout << count;
    return 0;
}