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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n,a=0,count=0,c,d;
    char *str;    
    scanf("%d",&n);
    str=(char *)malloc(sizeof(char)*n);
    scanf("%s",str);
    for(int i=0;i<n;i++)
        {
           c=a;
           if(str[i]=='U')
               a++;
           else
               a--;
           d=a;
        if(c==-1 && d==0)
            count++;
    }
    printf("%d",count);
    
    return 0;
}