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

int main() {
    
    long n,i,level=0,count=0;
    char a[1000000];
    
    scanf("%ld",&n);
    int flg=0;
    scanf("%s",a);
    for(i=0;i<n;i++)
    {
       // printf("flag=%d ",flg);
        if(a[i]=='U')
            level++;
        else
            level--;
        if(level<0)
            flg=1;
       // printf("%ld ",level);
        
        if(level>=0 && flg==1)
        {
            flg=0;
            count++;
            //printf(" count=%ld flag=%d\n",count,flg); 
        }
            
    }
    
       
    printf("%ld",count);
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
    return 0;
}