using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
    
class Solution {
    static void Main(String[] args) {
        var n = Convert.ToInt32(Console.ReadLine());
        var steps = Console.ReadLine().ToArray();

        var count = 0;
        var plain = new int[n+2];

        for(var i = 1; i < n+1; i++){
            plain[i] = plain[i-1] + (steps[i-1].Equals('U') ? 1 : -1);

            count += plain[i].Equals(0) && plain[i-1].Equals(-1) ? 1 : 0;
        }

        Console.WriteLine(count);
    }
}