#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 */    
    
    //get number of steps
    unsigned int num_steps;
    do{
        scanf("%d",&num_steps);
    }
    while(num_steps <= 0);
    
    char* movement = (char*)malloc(num_steps * sizeof(char));
    
    //char* movement;
    scanf("%s", movement);
    
    int height = 0;
    int temp = 0;
    
    //initialize valley counter = 0;
    int valley_counter = 0;
    
    

        
    //itirate through the string, U will add one to height, D will subtract one from height
    for(char* t = movement; *t != '\0'; t++)
    {
        if (*t == 'U')
            {
                height += 1;
            }
        else if (*t == 'D')
            {
                height -= 1;
            }
        
        //checking for sea level condition againts previous height and then updating previous height
        if (height == 0 && height > temp)
            {valley_counter++;}
            
        temp = height;
            
        
    }

    printf("%i\n", valley_counter);
    
    
    
    
    
    return 0;
}