#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,valleys=0,mountains=0,position=0;
    scanf("%d",&n);
    
    char steps[n];
    
    scanf("%s",steps);
    
   for(int i = 0; i < n; i++){
    if(steps[i] == 'U'){
        position++;
        if(position == 0){
            valleys++;
        }
    }
    else if(steps[i] == 'D'){
        position--;
        if(position == 0){
            mountains++;
        }
    }
    //printf("%d\n", position);
}

printf("%d", valleys);
    
    return 0;
}