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

int main() {
    int n; 
    scanf("%d\n",&n);
    char *a = malloc(sizeof(char) * n);
    for(int height_i = 0; height_i < n; height_i++){
       scanf("%c",&a[height_i]);
    }
    int cnt = 0;
    int lvl = 0;
    for(int i = 0; i < n; ++i) {
        if(a[i] == 'U') {
            lvl++;
            if (lvl == 0) {
                cnt++;
            }
        } else {
            lvl--;
        }
    }
    printf("%d", cnt);
    free(a);
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
    return 0;
}