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


int main() {
    int n=0;
    char c = 'x';
    int count=0, height=0;
    
    
    cin >> n;
    
    
    for(int i=0; i<n+1; i++)
    {
        c = getchar();
        if (c == 'U')
        {
            if(height == -1)
            {
                count++;  
            }
            height++;    
        }
        else if (c == 'D')
        {
            height--;
        }
    }
    
    cout << count;
    
    
        
    return 0;
}