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

int main() {

    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
    int n;
    scanf("%d",&n);
    char str[n+1];
    scanf("%s",str);
    int count = 0;
    int pre = 0;
    int valley = 0;
    for(int i=0;i<=n-1;i++){
        if(str[i] == 'U'){
            count++;
        }
        else{
            count--;
        }
      
        if(count == -1 && pre == 0){
            valley++;
        }
        pre = count;
    }
    printf("%d",valley);
    
    return 0;
}