#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,i=0,v=0;
    scanf("%ld",&n);
    char a[n];
    scanf("%s",a);
    int level=0;
    do
    {if(a[i]=='U') level++;
    else level--;
    if(level==0&&a[i]=='U') v++;
     i++; 
    }while(i<n);
    printf("%ld",v); 
    return 0;
}