#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <cstring>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int i,j,k, len, upcnt, dncnt,n;
    bool val_flag;
    char seq;
    while(scanf("%d\n",&n)!=EOF){
       // getchar();
        len = n;
        upcnt=dncnt=0;
        val_flag = false;
        j=0;
        for(i=0;i<len;i++){
            scanf("%c",&seq);
            if(seq=='U') upcnt++;
            else upcnt--;
            
            if(upcnt==-1){
                val_flag = true;
            }
            if(upcnt==0 && val_flag==true){
                j++;
                val_flag = false;
            }
                
        }
        printf("%d\n",j);
    }
    return 0;
}