#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 long int n, i, m=0 , count=0;
    scanf("%lld", &n);
    char* a=(char*)malloc((n+1)*sizeof(char));
    scanf("%s", a);
    for(i=0 ; i<n ; i++){
        if(a[i]=='U')
            m++;
        else if(a[i]=='D')
            m--;
        if(m==0&&a[i]=='U')
            count++;
    }   
    printf("%lld", count);
    return 0;
}