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

int main() {
    long n,prev=0,j=0,i,ct=0;
    char c;
    scanf("%ld",&n);
    for(i=1;i<=n;i++)
        {
        c=getchar();
        prev=j;
        if(c=='U')
            j++;
        else if(c=='D')
            j--;
        if(prev==0 && j<0)
            ct++;
            
        
    }
    printf("%ld",ct);

    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
    return 0;
}