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

int main() {
int n,v=0,m=0;
    scanf("%d",&n);
    int *asYouHike = malloc(sizeof(int) * (n+1));
    char *step = malloc(sizeof(char) * n);
    for(int i=0;i<=n;i++) {
    scanf("%c",&step[i]);
    }
    asYouHike[0]=0;
    for(int i=0;i<n;i++){
        if(step[i+1]=='U' || step[i+1]=='u'){
            asYouHike[i+1]=asYouHike[i]+1;
        }else {
            m++;
            asYouHike[i+1]=asYouHike[i]-1;
        }
    }
                        
    for(int i=0;i<(n+1);i++){
        //printf("%d:",asYouHike[i]);
        if(asYouHike[i]==0){
            if(asYouHike[i-1]<0){
            v++;
            }
        }
    }
    
                        
    printf("%d",(v));
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
    return 0;
}