#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

#define FALSE 0
#define TRUE  1

int main() 
{
    int n, level, valley, count; 
    scanf("%d", &n);
    char h[n];
  
    scanf("%s", h);
    //printf("n=%d, h=[%s]\n", n, h);
    
    level = 0;
    valley = FALSE;
    count = 0;

    for (int idx = 0; idx < n; idx++)
    {
        //printf("idx=%d\n", idx);
        //printf("%c", h[idx]);

        if ('U' == h[idx])
        {
            level++;
        }

        if ('D' == h[idx])
        {
            level--;
        }

        if ((FALSE == valley) && (level < 0))
        {
            valley = TRUE;
        }
        if ((TRUE == valley)  && (level >= 0))
        {
            valley = FALSE;
            count++;
        }

        //printf("level = %d valley = %d count = %d\n", level, valley, count);
    }
    printf("%d", count);
    
    return 0;
}