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

int main() {
    int n,i,c=0,ans=0;
    scanf("%d",&n);
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
    char *ch=(char *)malloc(sizeof(char)*n);
    scanf("%s",ch);
    for(i=0;i<n;i++)
        {
            if(ch[i]=='U')
                c++;
        else
            c--;
        if(c==0)
            {
            ans++;
            if(((i+1)<n && ch[i+1]=='D' )
                ans++;
        }
            
        
    }
   
    printf("%d",ans/2);
    return 0;
}