#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 */  
    long n;
    int i=0,u=0,d=0,valley=0;
	char a[1000000];
	scanf("%li",&n);
	if(n>=2 && n<=1000000)
        {
    scanf("%s",a);
 
    for(i=0;i<n;i++)
    {
        if(a[i]=='U')
            {
            u++;
            d--;
 
        }
        if(a[i]=='D')
            {
            d++;
            u--;
            if(d==1 && u<=0)
        valley++;
        }
    }
    printf("%d",valley);
 
    }
        return 0;
}