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

int main() {
	int n; 
    scanf("%d\n",&n);
    char *steps = malloc(sizeof(int) * n);
    if(!steps) {
		puts("Fail in memory alloction!");
    	exit(1);
    }
    for(int i = 0; i < n; i++){
       scanf("%c",&steps[i]);
    }
    int count = 0, log = 0;
    for(int i=0;i<n;i++) {
    	if(steps[i] == 'U') {
    		if(!++log) {
    			count++;
    		}
    	} else {
    		log--;
    	}
    }
    printf("%d\n", count);
    return 0;
}