#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 i,j,sea=0,h=0,n,count=0;
    char a[1000000];
    scanf("%d",&n);
    if(n<2)
        exit(0);
    for(i=0;i<n;i++)
        scanf("%s",&a[i]);
    for(i=0;i<n;i++)
        {
        if(a[i]=='U')
            {
            h++;
            if(h==sea)
                {
                count++;
            }
        }
        else if(a[i]=='D')
            {
            h--;
        }
        else
             printf("invalid entry!");
    }
    printf("%d",count);
    
        return 0;
}