#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 *height = malloc(sizeof(char) * n);
    for(int height_i = 0; height_i < n+1; height_i++){
       scanf("%c",&height[height_i]);
    }
    
    //printf("%s",height);
    
    int ch = 0; // + is above sea level, - is below
    int count = 0;
    int dfs = 0;
    
    // DDUU    DDUD  UUUD
    
    // ch = -1, -2, -1, -2, -1, 
    // dfs = 1, 0
    
    //printf("n = %d\n",n);
    //printf("array = '%s' \n",height);
    
    
    for( int i = 1; i < n+1; i++ ){
        //printf("%c ", height[i] );
        if( height[i] == 'U' ){
            //printf("uphill\n");
            if( ch == -1 ){
                if( dfs == 1 ){
                    count ++;
                }
                dfs = 0;
            }
            ch++;
        }
        else{
            //printf("downhill\n");
            if( ch == 0 ){
                dfs = 1;
            }
            ch--;
        }
        //printf("i = %d, ch = %d , dfs = %d, count = %d\n",i,ch,dfs,count);
    }
    
    printf("%d",count);
    
    return 0;
}