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

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